diff --git a/composer.json b/composer.json
index 975782c..d90bf27 100644
--- a/composer.json
+++ b/composer.json
@@ -1,15 +1,14 @@
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-    "prefer-stable": true,
     "require": {
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-        "flashwave/sasae": "dev-master",
+        "flashwave/index": "^0.2408.40014",
+        "flashwave/sasae": "^1.1",
+        "flashwave/syokuhou": "^1.2",
         "erusev/parsedown": "~1.6",
         "chillerlan/php-qrcode": "^4.3",
         "symfony/mailer": "^6.0",
         "matomo/device-detector": "^6.1",
         "sentry/sdk": "^4.0",
-        "flashwave/syokuhou": "dev-master"
+        "nesbot/carbon": "^3.7"
     },
     "autoload": {
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@@ -34,6 +33,6 @@
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     },
     "require-dev": {
-        "phpstan/phpstan": "^1.10"
+        "phpstan/phpstan": "^1.11"
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 }
diff --git a/composer.lock b/composer.lock
index bfa6d3c..4cd2353 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,8 +4,77 @@
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+    "content-hash": "cec099ea3b4fce65aa1b1ff6b0b40f24",
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+                "phpunit/phpunit": "^10.3"
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+                "doctrine",
+                "time"
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@@ -349,30 +418,26 @@
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-            "version": "dev-master",
+            "version": "v0.2408.40014",
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-                "reference": "e4c8ed711e045cffe840ba10a239ede14b0b171f"
+                "reference": "fbca708fbd75e8ecc6b36b39c1307a67bf250808"
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+                "php": ">=8.3"
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-                "phpunit/phpunit": "^10.2"
+                "phpstan/phpstan": "^1.11",
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@@ -391,27 +456,26 @@
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             "homepage": "https://railgun.sh/index",
-            "time": "2024-04-10T23:40:14+00:00"
+            "time": "2024-08-04T00:14:17+00:00"
         },
         {
             "name": "flashwave/sasae",
-            "version": "dev-master",
+            "version": "v1.1.0",
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                 "url": "https://patchii.net/flash/sasae.git",
-                "reference": "c8a9f2974e6591215b3f898dd5525de1e8367f66"
+                "reference": "ad63107a4387aa35c45bce71c2d6262a15b96f9d"
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-                "twig/html-extra": "^3.7",
-                "twig/twig": "^3.7"
+                "flashwave/index": "^0.2408.40014",
+                "php": ">=8.3",
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@@ -432,25 +496,24 @@
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             "description": "A wrapper for Twig with added common functionality.",
             "homepage": "https://railgun.sh/sasae",
-            "time": "2024-01-04T02:13:42+00:00"
+            "time": "2024-08-04T00:48:17+00:00"
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@@ -471,20 +534,20 @@
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             "homepage": "https://railgun.sh/syokuhou",
-            "time": "2024-06-03T22:59:30+00:00"
+            "time": "2024-08-04T01:07:23+00:00"
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+            "version": "2.7.0",
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                 "url": "https://github.com/guzzle/psr7.git",
-                "reference": "45b30f99ac27b5ca93cb4831afe16285f57b8221"
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-                "reference": "45b30f99ac27b5ca93cb4831afe16285f57b8221",
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@@ -499,8 +562,8 @@
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@@ -571,7 +634,7 @@
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-                "source": "https://github.com/guzzle/psr7/tree/2.6.2"
+                "source": "https://github.com/guzzle/psr7/tree/2.7.0"
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@@ -587,7 +650,7 @@
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-            "time": "2023-12-03T20:05:35+00:00"
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@@ -771,6 +834,160 @@
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             "time": "2019-09-10T13:16:29+00:00"
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+                "url": "https://github.com/php-fig/clock.git",
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+            "type": "library",
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+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
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+            "authors": [
+                {
+                    "name": "PHP-FIG",
+                    "homepage": "https://www.php-fig.org/"
+                }
+            ],
+            "description": "Common interface for reading the clock.",
+            "homepage": "https://github.com/php-fig/clock",
+            "keywords": [
+                "clock",
+                "now",
+                "psr",
+                "psr-20",
+                "time"
+            ],
+            "support": {
+                "issues": "https://github.com/php-fig/clock/issues",
+                "source": "https://github.com/php-fig/clock/tree/1.0.0"
+            },
+            "time": "2022-11-25T14:36:26+00:00"
+        },
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             "version": "2.0.2",
@@ -1220,6 +1437,80 @@
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             "time": "2024-07-16T13:45:27+00:00"
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+            "version": "v7.1.1",
+            "source": {
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+                "url": "https://github.com/symfony/clock.git",
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+                "symfony/polyfill-php83": "^1.28"
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+            "provide": {
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+            "type": "library",
+            "autoload": {
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+                    "Resources/now.php"
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+                "psr-4": {
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+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Decouples applications from the system clock",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "clock",
+                "psr20",
+                "time"
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+            "support": {
+                "source": "https://github.com/symfony/clock/tree/v7.1.1"
+            },
+            "funding": [
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+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
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+                    "type": "github"
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@@ -2151,6 +2442,82 @@
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+            "autoload": {
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+                },
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+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "polyfill",
+                "portable",
+                "shim"
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+            "support": {
+                "source": "https://github.com/symfony/polyfill-php83/tree/v1.30.0"
+            },
+            "funding": [
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+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
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+                    "type": "github"
+                },
+                {
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+            "time": "2024-06-19T12:35:24+00:00"
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@@ -2234,6 +2601,178 @@
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             "time": "2024-04-18T09:32:20+00:00"
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+                "url": "https://github.com/symfony/translation.git",
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+            "require-dev": {
+                "nikic/php-parser": "^4.18|^5.0",
+                "psr/log": "^1|^2|^3",
+                "symfony/config": "^6.4|^7.0",
+                "symfony/console": "^6.4|^7.0",
+                "symfony/dependency-injection": "^6.4|^7.0",
+                "symfony/finder": "^6.4|^7.0",
+                "symfony/http-client-contracts": "^2.5|^3.0",
+                "symfony/http-kernel": "^6.4|^7.0",
+                "symfony/intl": "^6.4|^7.0",
+                "symfony/polyfill-intl-icu": "^1.21",
+                "symfony/routing": "^6.4|^7.0",
+                "symfony/service-contracts": "^2.5|^3",
+                "symfony/yaml": "^6.4|^7.0"
+            },
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "Resources/functions.php"
+                ],
+                "psr-4": {
+                    "Symfony\\Component\\Translation\\": ""
+                },
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Fabien Potencier",
+                    "email": "fabien@symfony.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Provides tools to internationalize your application",
+            "homepage": "https://symfony.com",
+            "support": {
+                "source": "https://github.com/symfony/translation/tree/v7.1.3"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2024-07-26T12:41:01+00:00"
+        },
+        {
+            "name": "symfony/translation-contracts",
+            "version": "v3.5.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/translation-contracts.git",
+                "reference": "b9d2189887bb6b2e0367a9fc7136c5239ab9b05a"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/translation-contracts/zipball/b9d2189887bb6b2e0367a9fc7136c5239ab9b05a",
+                "reference": "b9d2189887bb6b2e0367a9fc7136c5239ab9b05a",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.1"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "3.5-dev"
+                },
+                "thanks": {
+                    "name": "symfony/contracts",
+                    "url": "https://github.com/symfony/contracts"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Contracts\\Translation\\": ""
+                },
+                "exclude-from-classmap": [
+                    "/Test/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Generic abstractions related to translation",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "abstractions",
+                "contracts",
+                "decoupling",
+                "interfaces",
+                "interoperability",
+                "standards"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/translation-contracts/tree/v3.5.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2024-04-18T09:32:20+00:00"
+        },
         {
             "name": "twig/html-extra",
             "version": "v3.10.0",
@@ -2385,16 +2924,16 @@
     "packages-dev": [
         {
             "name": "phpstan/phpstan",
-            "version": "1.11.7",
+            "version": "1.11.9",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpstan/phpstan.git",
-                "reference": "52d2bbfdcae7f895915629e4694e9497d0f8e28d"
+                "reference": "e370bcddadaede0c1716338b262346f40d296f82"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/52d2bbfdcae7f895915629e4694e9497d0f8e28d",
-                "reference": "52d2bbfdcae7f895915629e4694e9497d0f8e28d",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/e370bcddadaede0c1716338b262346f40d296f82",
+                "reference": "e370bcddadaede0c1716338b262346f40d296f82",
                 "shasum": ""
             },
             "require": {
@@ -2439,17 +2978,13 @@
                     "type": "github"
                 }
             ],
-            "time": "2024-07-06T11:17:41+00:00"
+            "time": "2024-08-01T16:25:18+00:00"
         }
     ],
     "aliases": [],
-    "minimum-stability": "dev",
-    "stability-flags": {
-        "flashwave/index": 20,
-        "flashwave/sasae": 20,
-        "flashwave/syokuhou": 20
-    },
-    "prefer-stable": true,
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
     "prefer-lowest": false,
     "platform": [],
     "platform-dev": [],
diff --git a/misuzu.php b/misuzu.php
index 15632e2..dd57a25 100644
--- a/misuzu.php
+++ b/misuzu.php
@@ -1,7 +1,6 @@
 <?php
 namespace Misuzu;
 
-use Index\Environment;
 use Index\Data\DbTools;
 use Syokuhou\DbConfig;
 use Syokuhou\FileConfig;
@@ -19,9 +18,9 @@ define('MSZ_ASSETS', MSZ_ROOT . '/assets');
 
 require_once MSZ_ROOT . '/vendor/autoload.php';
 
-Environment::setDebug(MSZ_DEBUG);
+error_reporting(MSZ_DEBUG ? -1 : 0);
 mb_internal_encoding('UTF-8');
-date_default_timezone_set('UTC');
+date_default_timezone_set('GMT');
 
 $cfg = FileConfig::fromFile(MSZ_CONFIG . '/config.cfg');
 
diff --git a/phpstan.neon b/phpstan.neon
index a2e3273..e8d840e 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -4,3 +4,6 @@ parameters:
     - src
   bootstrapFiles:
     - misuzu.php
+  dynamicConstantNames:
+    - MSZ_CLI
+    - MSZ_DEBUG
diff --git a/public-legacy/forum/posting.php b/public-legacy/forum/posting.php
index 9904fbb..2cf7b3f 100644
--- a/public-legacy/forum/posting.php
+++ b/public-legacy/forum/posting.php
@@ -3,9 +3,10 @@ namespace Misuzu;
 
 use stdClass;
 use RuntimeException;
-use Index\DateTime;
 use Misuzu\Forum\ForumTopicInfo;
 use Misuzu\Parsers\Parser;
+use Index\XDateTime;
+use Carbon\CarbonImmutable;
 
 $authInfo = $msz->getAuthInfo();
 if(!$authInfo->isLoggedIn())
@@ -152,11 +153,11 @@ if(!empty($_POST)) {
         if($mode === 'create') {
             $postTimeout = $cfg->getInteger('forum.posting.timeout', 5);
             if($postTimeout > 0) {
-                $postTimeoutThreshold = DateTime::now()->modify(sprintf('-%d seconds', $postTimeout));
+                $postTimeoutThreshold = new CarbonImmutable(sprintf('-%d seconds', $postTimeout));
                 $lastPostCreatedAt = $forumPosts->getUserLastPostCreatedAt($currentUser);
 
-                if($lastPostCreatedAt->isMoreThan($postTimeoutThreshold)) {
-                    $waitSeconds = $postTimeout + ($lastPostCreatedAt->getUnixTimeSeconds() - time());
+                if(XDateTime::compare($lastPostCreatedAt, $postTimeoutThreshold) > 0) {
+                    $waitSeconds = $postTimeout + ((int)$lastPostCreatedAt->format('U') - time());
 
                     $notices[] = sprintf("You're posting too quickly! Please wait %s seconds before posting again.", number_format($waitSeconds));
                     $notices[] = "It's possible that your post went through successfully and you pressed the submit button twice by accident.";
diff --git a/public-legacy/manage/changelog/change.php b/public-legacy/manage/changelog/change.php
index 5633fb6..981b295 100644
--- a/public-legacy/manage/changelog/change.php
+++ b/public-legacy/manage/changelog/change.php
@@ -3,9 +3,9 @@ namespace Misuzu;
 
 use DateTimeInterface;
 use RuntimeException;
-use Index\DateTime;
-use Index\XArray;
 use Misuzu\Changelog\Changelog;
+use Carbon\CarbonImmutable;
+use Index\{XArray,XDateTime};
 
 $authInfo = $msz->getAuthInfo();
 if(!$authInfo->getPerms('global')->check(Perm::G_CL_CHANGES_MANAGE))
@@ -58,8 +58,8 @@ while($_SERVER['REQUEST_METHOD'] === 'POST' && CSRF::validateRequest()) {
     if(empty($createdAt))
         $createdAt = null;
     else {
-        $createdAt = DateTime::createFromFormat(DateTimeInterface::ATOM, $createdAt . ':00Z');
-        if($createdAt->getUnixTimeSeconds() < 0)
+        $createdAt = CarbonImmutable::createFromFormat(DateTimeInterface::ATOM, $createdAt . ':00Z');
+        if((int)$createdAt->format('U') < 0)
             $createdAt = null;
     }
 
@@ -72,7 +72,7 @@ while($_SERVER['REQUEST_METHOD'] === 'POST' && CSRF::validateRequest()) {
             $summary = null;
         if($body === $changeInfo->getBody())
             $body = null;
-        if($createdAt !== null && $createdAt->equals($changeInfo->getCreatedAt()))
+        if($createdAt !== null && XDateTime::compare($createdAt, $changeInfo->getCreatedAt()) === 0)
             $createdAt = null;
         $updateUserInfo = $userId !== $changeInfo->getUserId();
 
diff --git a/public-legacy/manage/users/ban.php b/public-legacy/manage/users/ban.php
index 3cea458..b537e0e 100644
--- a/public-legacy/manage/users/ban.php
+++ b/public-legacy/manage/users/ban.php
@@ -3,7 +3,7 @@ namespace Misuzu;
 
 use DateTimeInterface;
 use RuntimeException;
-use Index\DateTime;
+use Carbon\CarbonImmutable;
 
 $authInfo = $msz->getAuthInfo();
 if(!$authInfo->getPerms('user')->check(Perm::U_BANS_MANAGE))
@@ -56,7 +56,7 @@ while($_SERVER['REQUEST_METHOD'] === 'POST' && CSRF::validateRequest()) {
         if($expires === -1) {
             $expires = null;
         } elseif($expires === -2) {
-            $expires = DateTime::createFromFormat(DateTimeInterface::ATOM, $expiresCustom . ':00Z');
+            $expires = CarbonImmutable::createFromFormat(DateTimeInterface::ATOM, $expiresCustom . ':00Z');
         } else {
             echo 'Invalid duration specified.';
             break;
diff --git a/public-legacy/profile.php b/public-legacy/profile.php
index 46ef3bc..ae1f444 100644
--- a/public-legacy/profile.php
+++ b/public-legacy/profile.php
@@ -5,7 +5,6 @@ use stdClass;
 use InvalidArgumentException;
 use RuntimeException;
 use Index\ByteFormat;
-use Index\DateTime;
 use Misuzu\Parsers\Parser;
 use Misuzu\Users\User;
 use Misuzu\Users\Assets\UserAvatarAsset;
diff --git a/src/AuditLog/AuditLogInfo.php b/src/AuditLog/AuditLogInfo.php
index 4b2f654..41f0e74 100644
--- a/src/AuditLog/AuditLogInfo.php
+++ b/src/AuditLog/AuditLogInfo.php
@@ -2,7 +2,7 @@
 namespace Misuzu\AuditLog;
 
 use ValueError;
-use Index\DateTime;
+use Carbon\CarbonImmutable;
 use Index\Data\IDbResult;
 use Index\Net\IPAddress;
 
@@ -47,8 +47,8 @@ class AuditLogInfo {
         return $this->created;
     }
 
-    public function getCreatedAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->created);
+    public function getCreatedAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->created);
     }
 
     public function getRemoteAddressRaw(): string {
diff --git a/src/Auth/AuthInfo.php b/src/Auth/AuthInfo.php
index 0769997..d5ec157 100644
--- a/src/Auth/AuthInfo.php
+++ b/src/Auth/AuthInfo.php
@@ -1,7 +1,6 @@
 <?php
 namespace Misuzu\Auth;
 
-use Index\XArray;
 use Misuzu\Auth\SessionInfo;
 use Misuzu\Forum\ForumCategoryInfo;
 use Misuzu\Perms\IPermissionResult;
diff --git a/src/Auth/AuthTokenPacker.php b/src/Auth/AuthTokenPacker.php
index 7835362..e356288 100644
--- a/src/Auth/AuthTokenPacker.php
+++ b/src/Auth/AuthTokenPacker.php
@@ -2,8 +2,8 @@
 namespace Misuzu\Auth;
 
 use RuntimeException;
+use Index\UriBase64;
 use Index\IO\MemoryStream;
-use Index\Serialisation\UriBase64;
 
 class AuthTokenPacker {
     private const EPOCH_V2 = 1682985600;
diff --git a/src/Auth/LoginAttemptInfo.php b/src/Auth/LoginAttemptInfo.php
index d599e08..21888e7 100644
--- a/src/Auth/LoginAttemptInfo.php
+++ b/src/Auth/LoginAttemptInfo.php
@@ -1,10 +1,10 @@
 <?php
 namespace Misuzu\Auth;
 
-use Index\DateTime;
+use Misuzu\ClientInfo;
+use Carbon\CarbonImmutable;
 use Index\Data\IDbResult;
 use Index\Net\IPAddress;
-use Misuzu\ClientInfo;
 
 class LoginAttemptInfo {
     public function __construct(
@@ -57,8 +57,8 @@ class LoginAttemptInfo {
         return $this->created;
     }
 
-    public function getCreatedAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->created);
+    public function getCreatedAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->created);
     }
 
     public function getUserAgentString(): string {
diff --git a/src/Auth/LoginAttempts.php b/src/Auth/LoginAttempts.php
index 24d2170..6ebda9c 100644
--- a/src/Auth/LoginAttempts.php
+++ b/src/Auth/LoginAttempts.php
@@ -1,7 +1,6 @@
 <?php
 namespace Misuzu\Auth;
 
-use Index\TimeSpan;
 use Index\Data\DbStatementCache;
 use Index\Data\IDbConnection;
 use Index\Net\IPAddress;
@@ -23,14 +22,12 @@ class LoginAttempts {
         ?bool $success = null,
         UserInfo|string|null $userInfo = null,
         IPAddress|string|null $remoteAddr = null,
-        TimeSpan|int|null $timeRange = null
+        int|null $timeRange = null
     ): int {
         if($userInfo instanceof UserInfo)
             $userInfo = $userInfo->getId();
         if($remoteAddr instanceof IPAddress)
             $remoteAddr = (string)$remoteAddr;
-        if($timeRange instanceof TimeSpan)
-            $timeRange = (int)$timeRange->totalSeconds();
 
         $hasSuccess = $success !== null;
         $hasUserInfo = $userInfo !== null;
@@ -81,15 +78,13 @@ class LoginAttempts {
         ?bool $success = null,
         UserInfo|string|null $userInfo = null,
         IPAddress|string|null $remoteAddr = null,
-        TimeSpan|int|null $timeRange = null,
+        int|null $timeRange = null,
         ?Pagination $pagination = null
     ): iterable {
         if($userInfo instanceof UserInfo)
             $userInfo = $userInfo->getId();
         if($remoteAddr instanceof IPAddress)
             $remoteAddr = (string)$remoteAddr;
-        if($timeRange instanceof TimeSpan)
-            $timeRange = (int)$timeRange->totalSeconds();
 
         $hasSuccess = $success !== null;
         $hasUserInfo = $userInfo !== null;
diff --git a/src/Auth/RecoveryTokenInfo.php b/src/Auth/RecoveryTokenInfo.php
index 46a342b..70b0e92 100644
--- a/src/Auth/RecoveryTokenInfo.php
+++ b/src/Auth/RecoveryTokenInfo.php
@@ -1,7 +1,7 @@
 <?php
 namespace Misuzu\Auth;
 
-use Index\DateTime;
+use Carbon\CarbonImmutable;
 use Index\Data\IDbResult;
 use Index\Net\IPAddress;
 
@@ -36,16 +36,16 @@ class RecoveryTokenInfo {
         return $this->created;
     }
 
-    public function getCreatedAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->created);
+    public function getCreatedAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->created);
     }
 
     public function getExpiresTime(): int {
         return $this->created + self::LIFETIME;
     }
 
-    public function getExpiresAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->created + self::LIFETIME);
+    public function getExpiresAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->getExpiresTime());
     }
 
     public function hasExpired(): bool {
diff --git a/src/Auth/RecoveryTokens.php b/src/Auth/RecoveryTokens.php
index 213e8a6..72a255d 100644
--- a/src/Auth/RecoveryTokens.php
+++ b/src/Auth/RecoveryTokens.php
@@ -3,10 +3,10 @@ namespace Misuzu\Auth;
 
 use InvalidArgumentException;
 use RuntimeException;
+use Index\Base32;
 use Index\Data\DbStatementCache;
 use Index\Data\IDbConnection;
 use Index\Net\IPAddress;
-use Index\Serialisation\Base32;
 use Misuzu\ClientInfo;
 use Misuzu\Pagination;
 use Misuzu\Users\UserInfo;
diff --git a/src/Auth/SessionInfo.php b/src/Auth/SessionInfo.php
index 4fa9ecd..13e1ff1 100644
--- a/src/Auth/SessionInfo.php
+++ b/src/Auth/SessionInfo.php
@@ -1,10 +1,10 @@
 <?php
 namespace Misuzu\Auth;
 
-use Index\DateTime;
+use Misuzu\ClientInfo;
+use Carbon\CarbonImmutable;
 use Index\Data\IDbResult;
 use Index\Net\IPAddress;
-use Misuzu\ClientInfo;
 
 class SessionInfo {
     public function __construct(
@@ -91,8 +91,8 @@ class SessionInfo {
         return $this->expires;
     }
 
-    public function getExpiresAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->expires);
+    public function getExpiresAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->expires);
     }
 
     public function shouldBumpExpires(): bool {
@@ -107,8 +107,8 @@ class SessionInfo {
         return $this->created;
     }
 
-    public function getCreatedAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->created);
+    public function getCreatedAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->created);
     }
 
     public function hasLastActive(): bool {
@@ -119,7 +119,7 @@ class SessionInfo {
         return $this->lastActive;
     }
 
-    public function getLastActiveAt(): ?DateTime {
-        return $this->lastActive === null ? null : DateTime::fromUnixTimeSeconds($this->lastActive);
+    public function getLastActiveAt(): ?CarbonImmutable {
+        return $this->lastActive === null ? null : CarbonImmutable::createFromTimestampUTC($this->lastActive);
     }
 }
diff --git a/src/CSRF.php b/src/CSRF.php
index 37b0b45..d4e065f 100644
--- a/src/CSRF.php
+++ b/src/CSRF.php
@@ -1,7 +1,7 @@
 <?php
 namespace Misuzu;
 
-use Index\Security\CSRFP;
+use Index\CSRFP;
 
 final class CSRF {
     private static CSRFP $instance;
diff --git a/src/Changelog/ChangeInfo.php b/src/Changelog/ChangeInfo.php
index f852393..a765668 100644
--- a/src/Changelog/ChangeInfo.php
+++ b/src/Changelog/ChangeInfo.php
@@ -1,7 +1,7 @@
 <?php
 namespace Misuzu\Changelog;
 
-use Index\DateTime;
+use Carbon\CarbonImmutable;
 use Index\Data\IDbResult;
 
 class ChangeInfo {
@@ -53,8 +53,8 @@ class ChangeInfo {
         return $this->created;
     }
 
-    public function getCreatedAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->created);
+    public function getCreatedAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->created);
     }
 
     public function getDate(): string {
diff --git a/src/Changelog/ChangeTagInfo.php b/src/Changelog/ChangeTagInfo.php
index 4d8ddf7..3ad14a0 100644
--- a/src/Changelog/ChangeTagInfo.php
+++ b/src/Changelog/ChangeTagInfo.php
@@ -2,7 +2,7 @@
 namespace Misuzu\Changelog;
 
 use Stringable;
-use Index\DateTime;
+use Carbon\CarbonImmutable;
 use Index\Data\IDbResult;
 
 class ChangeTagInfo implements Stringable {
@@ -38,16 +38,16 @@ class ChangeTagInfo implements Stringable {
         return $this->created;
     }
 
-    public function getCreatedAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->created);
+    public function getCreatedAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->created);
     }
 
     public function getArchivedTime(): int {
         return $this->archived;
     }
 
-    public function getArchivedAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->created);
+    public function getArchivedAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->archived);
     }
 
     public function isArchived(): bool {
diff --git a/src/Changelog/Changelog.php b/src/Changelog/Changelog.php
index 1dc4a06..f663415 100644
--- a/src/Changelog/Changelog.php
+++ b/src/Changelog/Changelog.php
@@ -3,7 +3,7 @@ namespace Misuzu\Changelog;
 
 use InvalidArgumentException;
 use RuntimeException;
-use Index\DateTime;
+use DateTimeInterface;
 use Index\Data\DbStatementCache;
 use Index\Data\DbTools;
 use Index\Data\IDbConnection;
@@ -66,13 +66,13 @@ class Changelog {
 
     public function countChanges(
         UserInfo|string|null $userInfo = null,
-        DateTime|int|null $dateTime = null,
+        DateTimeInterface|int|null $dateTime = null,
         ?array $tags = null
     ): int {
         if($userInfo instanceof UserInfo)
             $userInfo = $userInfo->getId();
-        if($dateTime instanceof DateTime)
-            $dateTime = $dateTime->getUnixTimeSeconds();
+        if($dateTime instanceof DateTimeInterface)
+            $dateTime = (int)$dateTime->format('U');
 
         $args = 0;
         $hasUserInfo = $userInfo !== null;
@@ -118,14 +118,14 @@ class Changelog {
 
     public function getChanges(
         UserInfo|string|null $userInfo = null,
-        DateTime|int|null $dateTime = null,
+        DateTimeInterface|int|null $dateTime = null,
         ?array $tags = null,
         ?Pagination $pagination = null
     ): iterable {
         if($userInfo instanceof UserInfo)
             $userInfo = $userInfo->getId();
-        if($dateTime instanceof DateTime)
-            $dateTime = $dateTime->getUnixTimeSeconds();
+        if($dateTime instanceof DateTimeInterface)
+            $dateTime = (int)$dateTime->format('U');
 
         $args = 0;
         $hasUserInfo = $userInfo !== null;
@@ -189,14 +189,14 @@ class Changelog {
         string $summary,
         string $body = '',
         UserInfo|string|null $userInfo = null,
-        DateTime|int|null $createdAt = null
+        DateTimeInterface|int|null $createdAt = null
     ): ChangeInfo {
         if(is_string($action))
             $action = self::convertToActionId($action);
         if($userInfo instanceof UserInfo)
             $userInfo = $userInfo->getId();
-        if($createdAt instanceof DateTime)
-            $createdAt = $createdAt->getUnixTimeSeconds();
+        if($createdAt instanceof DateTimeInterface)
+            $createdAt = (int)$createdAt->format('U');
 
         $summary = trim($summary);
         if(empty($summary))
@@ -233,7 +233,7 @@ class Changelog {
         ?string $body = null,
         bool $updateUserInfo = false,
         UserInfo|string|null $userInfo = null,
-        DateTime|int|null $createdAt = null
+        DateTimeInterface|int|null $createdAt = null
     ): void {
         if($infoOrId instanceof ChangeInfo)
             $infoOrId = $infoOrId->getId();
@@ -242,8 +242,8 @@ class Changelog {
             $action = self::convertToActionId($action);
         if($userInfo instanceof UserInfo)
             $userInfo = $userInfo->getId();
-        if($createdAt instanceof DateTime)
-            $createdAt = $createdAt->getUnixTimeSeconds();
+        if($createdAt instanceof DateTimeInterface)
+            $createdAt = (int)$createdAt->format('U');
 
         if($summary !== null) {
             $summary = trim($summary);
diff --git a/src/Comments/CommentsCategoryInfo.php b/src/Comments/CommentsCategoryInfo.php
index df3f0d1..afd2df7 100644
--- a/src/Comments/CommentsCategoryInfo.php
+++ b/src/Comments/CommentsCategoryInfo.php
@@ -1,9 +1,9 @@
 <?php
 namespace Misuzu\Comments;
 
-use Index\DateTime;
-use Index\Data\IDbResult;
 use Misuzu\Users\UserInfo;
+use Carbon\CarbonImmutable;
+use Index\Data\IDbResult;
 
 class CommentsCategoryInfo {
     public function __construct(
@@ -54,16 +54,17 @@ class CommentsCategoryInfo {
         return $this->created;
     }
 
-    public function getCreatedAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->created);
+    public function getCreatedAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->created);
+
     }
 
     public function getLockedTime(): ?int {
         return $this->locked;
     }
 
-    public function getLockedAt(): ?DateTime {
-        return $this->locked === null ? null : DateTime::fromUnixTimeSeconds($this->locked);
+    public function getLockedAt(): ?CarbonImmutable {
+        return $this->locked === null ? null : CarbonImmutable::createFromTimestampUTC($this->locked);
     }
 
     public function isLocked(): bool {
diff --git a/src/Comments/CommentsPostInfo.php b/src/Comments/CommentsPostInfo.php
index 1a2595e..c3e811a 100644
--- a/src/Comments/CommentsPostInfo.php
+++ b/src/Comments/CommentsPostInfo.php
@@ -1,7 +1,7 @@
 <?php
 namespace Misuzu\Comments;
 
-use Index\DateTime;
+use Carbon\CarbonImmutable;
 use Index\Data\IDbResult;
 
 class CommentsPostInfo {
@@ -86,16 +86,16 @@ class CommentsPostInfo {
         return $this->created;
     }
 
-    public function getCreatedAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->created);
+    public function getCreatedAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->created);
     }
 
     public function getPinnedTime(): ?int {
         return $this->pinned;
     }
 
-    public function getPinnedAt(): DateTime {
-        return $this->pinned === null ? null : DateTime::fromUnixTimeSeconds($this->pinned);
+    public function getPinnedAt(): ?CarbonImmutable {
+        return $this->pinned === null ? null : CarbonImmutable::createFromTimestampUTC($this->pinned);
     }
 
     public function isPinned(): bool {
@@ -106,8 +106,8 @@ class CommentsPostInfo {
         return $this->updated;
     }
 
-    public function getUpdatedAt(): DateTime {
-        return $this->updated === null ? null : DateTime::fromUnixTimeSeconds($this->updated);
+    public function getUpdatedAt(): ?CarbonImmutable {
+        return $this->updated === null ? null : CarbonImmutable::createFromTimestampUTC($this->updated);
     }
 
     public function isEdited(): bool {
@@ -118,8 +118,8 @@ class CommentsPostInfo {
         return $this->deleted;
     }
 
-    public function getDeletedAt(): DateTime {
-        return $this->deleted === null ? null : DateTime::fromUnixTimeSeconds($this->deleted);
+    public function getDeletedAt(): ?CarbonImmutable {
+        return $this->deleted === null ? null : CarbonImmutable::createFromTimestampUTC($this->deleted);
     }
 
     public function isDeleted(): bool {
diff --git a/src/Counters/CounterInfo.php b/src/Counters/CounterInfo.php
index d277b7c..66967b6 100644
--- a/src/Counters/CounterInfo.php
+++ b/src/Counters/CounterInfo.php
@@ -1,7 +1,7 @@
 <?php
 namespace Misuzu\Counters;
 
-use Index\DateTime;
+use Carbon\CarbonImmutable;
 use Index\Data\IDbResult;
 
 class CounterInfo {
@@ -31,7 +31,7 @@ class CounterInfo {
         return $this->updated;
     }
 
-    public function getUpdatedAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->updated);
+    public function getUpdatedAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->updated);
     }
 }
diff --git a/src/Forum/ForumCategoryInfo.php b/src/Forum/ForumCategoryInfo.php
index a758517..8925921 100644
--- a/src/Forum/ForumCategoryInfo.php
+++ b/src/Forum/ForumCategoryInfo.php
@@ -1,7 +1,7 @@
 <?php
 namespace Misuzu\Forum;
 
-use Index\DateTime;
+use Carbon\CarbonImmutable;
 use Index\Colour\Colour;
 use Index\Data\IDbResult;
 
@@ -176,8 +176,8 @@ class ForumCategoryInfo {
         return $this->created;
     }
 
-    public function getCreatedAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->created);
+    public function getCreatedAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->created);
     }
 
     public function isArchived(): bool {
diff --git a/src/Forum/ForumPostInfo.php b/src/Forum/ForumPostInfo.php
index e1948cc..85d4014 100644
--- a/src/Forum/ForumPostInfo.php
+++ b/src/Forum/ForumPostInfo.php
@@ -1,10 +1,11 @@
 <?php
 namespace Misuzu\Forum;
 
-use Index\DateTime;
+use Misuzu\Parsers\Parser;
+use Carbon\CarbonImmutable;
+use Index\XDateTime;
 use Index\Data\IDbResult;
 use Index\Net\IPAddress;
-use Misuzu\Parsers\Parser;
 
 class ForumPostInfo {
     public function __construct(
@@ -93,16 +94,17 @@ class ForumPostInfo {
         return $this->created;
     }
 
-    public function getCreatedAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->created);
+    public function getCreatedAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->created);
     }
 
-    private static ?DateTime $markAsEditedThreshold = null;
+    private static ?CarbonImmutable $markAsEditedThreshold = null;
+
     public function shouldMarkAsEdited(): bool {
         if(self::$markAsEditedThreshold === null)
-            self::$markAsEditedThreshold = DateTime::now()->modify('-5 minutes');
+            self::$markAsEditedThreshold = new CarbonImmutable('-5 minutes');
 
-        return $this->getCreatedAt()->isLessThan(self::$markAsEditedThreshold);
+        return XDateTime::compare($this->getCreatedAt(), self::$markAsEditedThreshold) < 0;
     }
 
     public function isEdited(): bool {
@@ -113,16 +115,17 @@ class ForumPostInfo {
         return $this->edited;
     }
 
-    public function getEditedAt(): ?DateTime {
-        return $this->edited === null ? null : DateTime::fromUnixTimeSeconds($this->edited);
+    public function getEditedAt(): ?CarbonImmutable {
+        return $this->edited === null ? null : CarbonImmutable::createFromTimestampUTC($this->edited);
     }
 
-    private static ?DateTime $canBeDeletedThreshold = null;
+    private static ?CarbonImmutable $canBeDeletedThreshold = null;
+
     public function canBeDeleted(): bool {
         if(self::$canBeDeletedThreshold === null)
-            self::$canBeDeletedThreshold = DateTime::now()->modify('-1 week');
+            self::$canBeDeletedThreshold = new CarbonImmutable('-1 week');
 
-        return $this->getCreatedAt()->isMoreThanOrEqual(self::$canBeDeletedThreshold);
+        return XDateTime::compare($this->getCreatedAt(), self::$canBeDeletedThreshold) >= 0;
     }
 
     public function isDeleted(): bool {
@@ -133,7 +136,7 @@ class ForumPostInfo {
         return $this->deleted;
     }
 
-    public function getDeletedAt(): ?DateTime {
-        return $this->deleted === null ? null : DateTime::fromUnixTimeSeconds($this->deleted);
+    public function getDeletedAt(): ?CarbonImmutable {
+        return $this->deleted === null ? null : CarbonImmutable::createFromTimestampUTC($this->deleted);
     }
 }
diff --git a/src/Forum/ForumPosts.php b/src/Forum/ForumPosts.php
index 6c71c1e..7fe4e8a 100644
--- a/src/Forum/ForumPosts.php
+++ b/src/Forum/ForumPosts.php
@@ -4,7 +4,7 @@ namespace Misuzu\Forum;
 use InvalidArgumentException;
 use RuntimeException;
 use stdClass;
-use Index\DateTime;
+use Carbon\CarbonImmutable;
 use Index\Data\DbStatementCache;
 use Index\Data\DbTools;
 use Index\Data\IDbConnection;
@@ -395,8 +395,8 @@ class ForumPosts {
         return $result->getInteger(0);
     }
 
-    public function getUserLastPostCreatedAt(UserInfo|string $userInfo): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->getUserLastPostCreatedTime($userInfo));
+    public function getUserLastPostCreatedAt(UserInfo|string $userInfo): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->getUserLastPostCreatedTime($userInfo));
     }
 
     public function generatePostRankings(
diff --git a/src/Forum/ForumTopicInfo.php b/src/Forum/ForumTopicInfo.php
index c0d0e2c..2376af6 100644
--- a/src/Forum/ForumTopicInfo.php
+++ b/src/Forum/ForumTopicInfo.php
@@ -1,7 +1,8 @@
 <?php
 namespace Misuzu\Forum;
 
-use Index\DateTime;
+use Carbon\CarbonImmutable;
+use Index\XDateTime;
 use Index\Data\IDbResult;
 
 class ForumTopicInfo {
@@ -136,25 +137,25 @@ class ForumTopicInfo {
         return $this->created;
     }
 
-    public function getCreatedAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->created);
+    public function getCreatedAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->created);
     }
 
-    private static ?DateTime $lastActiveAt = null;
+    private static ?CarbonImmutable $lastActiveAt = null;
 
     public function isActive(): bool {
         if(self::$lastActiveAt === null)
-            self::$lastActiveAt = DateTime::now()->modify('-1 month');
+            self::$lastActiveAt = new CarbonImmutable('-1 month');
 
-        return $this->getBumpedAt()->isMoreThanOrEqual(self::$lastActiveAt);
+        return XDateTime::compare($this->getBumpedAt(), self::$lastActiveAt) >= 0;
     }
 
     public function getBumpedTime(): int {
         return $this->bumped;
     }
 
-    public function getBumpedAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->bumped);
+    public function getBumpedAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->bumped);
     }
 
     public function isDeleted(): bool {
@@ -165,8 +166,8 @@ class ForumTopicInfo {
         return $this->deleted;
     }
 
-    public function getDeletedAt(): ?DateTime {
-        return $this->deleted === null ? null : DateTime::fromUnixTimeSeconds($this->deleted);
+    public function getDeletedAt(): ?CarbonImmutable {
+        return $this->deleted === null ? null : CarbonImmutable::createFromTimestampUTC($this->deleted);
     }
 
     public function isLocked(): bool {
@@ -177,7 +178,7 @@ class ForumTopicInfo {
         return $this->locked;
     }
 
-    public function getLockedAt(): ?DateTime {
-        return $this->locked === null ? null : DateTime::fromUnixTimeSeconds($this->locked);
+    public function getLockedAt(): ?CarbonImmutable {
+        return $this->locked === null ? null : CarbonImmutable::createFromTimestampUTC($this->locked);
     }
 }
diff --git a/src/Forum/ForumTopicRedirectInfo.php b/src/Forum/ForumTopicRedirectInfo.php
index 7e465b0..74aeeae 100644
--- a/src/Forum/ForumTopicRedirectInfo.php
+++ b/src/Forum/ForumTopicRedirectInfo.php
@@ -1,7 +1,7 @@
 <?php
 namespace Misuzu\Forum;
 
-use Index\DateTime;
+use Carbon\CarbonImmutable;
 use Index\Data\IDbResult;
 
 class ForumTopicRedirectInfo {
@@ -41,7 +41,7 @@ class ForumTopicRedirectInfo {
         return $this->created;
     }
 
-    public function getCreatedAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->created);
+    public function getCreatedAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->created);
     }
 }
diff --git a/src/Hanyuu/HanyuuRoutes.php b/src/Hanyuu/HanyuuRoutes.php
index bc4e06b..af51134 100644
--- a/src/Hanyuu/HanyuuRoutes.php
+++ b/src/Hanyuu/HanyuuRoutes.php
@@ -3,9 +3,9 @@ namespace Misuzu\Hanyuu;
 
 use stdClass;
 use RuntimeException;
+use Index\UriBase64;
 use Index\Colour\Colour;
 use Index\Http\Routing\{HttpGet,HttpMiddleware,HttpPost,RouteHandler};
-use Index\Serialisation\UriBase64;
 use Syokuhou\IConfig;
 use Misuzu\CSRF;
 use Misuzu\Auth\{AuthContext,AuthInfo,Sessions};
@@ -18,8 +18,7 @@ final class HanyuuRoutes extends RouteHandler {
         private IConfig $impersonateConfig, // this sucks lol
         private URLRegistry $urls,
         private UsersContext $usersCtx,
-        private AuthContext $authCtx,
-        private AuthInfo $authInfo
+        private AuthContext $authCtx
     ) {}
 
     private function getEndpoint(): string {
diff --git a/src/Home/HomeRoutes.php b/src/Home/HomeRoutes.php
index 68f960a..6fa9807 100644
--- a/src/Home/HomeRoutes.php
+++ b/src/Home/HomeRoutes.php
@@ -2,7 +2,7 @@
 namespace Misuzu\Home;
 
 use RuntimeException;
-use Index\DateTime;
+use Index\XDateTime;
 use Index\Data\{DbTools,IDbConnection};
 use Index\Http\Routing\{HttpGet,RouteHandler};
 use Syokuhou\IConfig;
@@ -167,7 +167,7 @@ class HomeRoutes extends RouteHandler {
         $stats['users:online:recent'] = count($onlineUserInfos);
 
         $birthdays = [];
-        $birthdayInfos = $this->usersCtx->getUsers()->getUsers(deleted: false, birthdate: DateTime::now(), orderBy: 'random');
+        $birthdayInfos = $this->usersCtx->getUsers()->getUsers(deleted: false, birthdate: XDateTime::now(), orderBy: 'random');
         foreach($birthdayInfos as $birthdayInfo)
             $birthdays[] = [
                 'info' => $birthdayInfo,
diff --git a/src/Messages/MessageInfo.php b/src/Messages/MessageInfo.php
index 9562fa5..60c96a1 100644
--- a/src/Messages/MessageInfo.php
+++ b/src/Messages/MessageInfo.php
@@ -1,9 +1,9 @@
 <?php
 namespace Misuzu\Messages;
 
-use Index\DateTime;
-use Index\Data\IDbResult;
 use Misuzu\Parsers\Parser;
+use Carbon\CarbonImmutable;
+use Index\Data\IDbResult;
 
 class MessageInfo {
     public function __construct(
@@ -98,8 +98,8 @@ class MessageInfo {
         return $this->created;
     }
 
-    public function getCreatedAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->created);
+    public function getCreatedAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->created);
     }
 
     public function isSent(): bool {
@@ -110,8 +110,8 @@ class MessageInfo {
         return $this->sent;
     }
 
-    public function getSentAt(): ?DateTime {
-        return $this->sent === null ? null : DateTime::fromUnixTimeSeconds($this->sent);
+    public function getSentAt(): ?CarbonImmutable {
+        return $this->sent === null ? null : CarbonImmutable::createFromTimestampUTC($this->sent);
     }
 
     public function isRead(): bool {
@@ -122,8 +122,8 @@ class MessageInfo {
         return $this->read;
     }
 
-    public function getReadAt(): ?DateTime {
-        return $this->read === null ? null : DateTime::fromUnixTimeSeconds($this->read);
+    public function getReadAt(): ?CarbonImmutable {
+        return $this->read === null ? null : CarbonImmutable::createFromTimestampUTC($this->read);
     }
 
     public function isDeleted(): bool {
@@ -134,8 +134,8 @@ class MessageInfo {
         return $this->deleted;
     }
 
-    public function getDeletedAt(): ?DateTime {
-        return $this->deleted === null ? null : DateTime::fromUnixTimeSeconds($this->deleted);
+    public function getDeletedAt(): ?CarbonImmutable {
+        return $this->deleted === null ? null : CarbonImmutable::createFromTimestampUTC($this->deleted);
     }
 
     public function getDisplayTime(): int {
@@ -144,7 +144,7 @@ class MessageInfo {
         return $this->getCreatedTime();
     }
 
-    public function getDisplayAt(): DateTime {
+    public function getDisplayAt(): CarbonImmutable {
         if($this->isSent())
             return $this->getSentAt();
         return $this->getCreatedAt();
diff --git a/src/Messages/MessagesDatabase.php b/src/Messages/MessagesDatabase.php
index 78d4c14..a3b0ce4 100644
--- a/src/Messages/MessagesDatabase.php
+++ b/src/Messages/MessagesDatabase.php
@@ -3,7 +3,7 @@ namespace Misuzu\Messages;
 
 use InvalidArgumentException;
 use RuntimeException;
-use Index\DateTime;
+use DateTimeInterface;
 use Index\Data\{DbStatementCache,DbTools,IDbConnection};
 use Misuzu\Pagination;
 use Misuzu\Users\UserInfo;
@@ -189,8 +189,8 @@ class MessagesDatabase {
         string $body,
         int $parser,
         MessageInfo|string|null $replyTo = null,
-        DateTime|int|null $sentAt = null,
-        DateTime|int|null $readAt = null
+        DateTimeInterface|int|null $sentAt = null,
+        DateTimeInterface|int|null $readAt = null
     ): MessageInfo {
         $stmt = $this->cache->get('INSERT INTO msz_messages (msg_id, msg_owner_id, msg_author_id, msg_recipient_id, msg_reply_to, msg_title, msg_body, msg_parser, msg_sent, msg_read) VALUES (?, ?, ?, ?, ?, TO_BASE64(?), TO_BASE64(?), ?, FROM_UNIXTIME(?), FROM_UNIXTIME(?))');
         $stmt->addParameter(1, $messageId);
@@ -201,8 +201,8 @@ class MessagesDatabase {
         $stmt->addParameter(6, $title);
         $stmt->addParameter(7, $body);
         $stmt->addParameter(8, $parser);
-        $stmt->addParameter(9, $sentAt instanceof DateTime ? $sentAt->getUnixTimeSeconds() : $sentAt);
-        $stmt->addParameter(10, $readAt instanceof DateTime ? $readAt->getUnixTimeSeconds() : $readAt);
+        $stmt->addParameter(9, $sentAt instanceof DateTimeInterface ? (int)$sentAt->format('U') : $sentAt);
+        $stmt->addParameter(10, $readAt instanceof DateTimeInterface ? (int)$readAt->format('U') : $readAt);
         $stmt->execute();
 
         return $this->getMessageInfo($ownerInfo, $messageId);
@@ -214,8 +214,8 @@ class MessagesDatabase {
         ?string $title = null,
         ?string $body = null,
         ?int $parser = null,
-        DateTime|int|null|false $sentAt = false,
-        DateTime|int|null|false $readAt = false
+        DateTimeInterface|int|null|false $sentAt = false,
+        DateTimeInterface|int|null|false $readAt = false
     ): void {
         $setQuery = [];
         $setValues = [];
@@ -249,12 +249,12 @@ class MessagesDatabase {
 
         if($sentAt !== false) {
             $setQuery[] = 'msg_sent = FROM_UNIXTIME(?)';
-            $setValues[] = $sentAt instanceof DateTime ? $sentAt->getUnixTimeSeconds() : $sentAt;
+            $setValues[] = $sentAt instanceof DateTimeInterface ? (int)$sentAt->format('U') : $sentAt;
         }
 
         if($readAt !== false) {
             $setQuery[] = 'msg_read = FROM_UNIXTIME(?)';
-            $setValues[] = $readAt instanceof DateTime ? $readAt->getUnixTimeSeconds() : $readAt;
+            $setValues[] = $readAt instanceof DateTimeInterface ? (int)$readAt->format('U') : $readAt;
         }
 
         if(empty($whereQuery))
diff --git a/src/MisuzuContext.php b/src/MisuzuContext.php
index a598070..6b887f3 100644
--- a/src/MisuzuContext.php
+++ b/src/MisuzuContext.php
@@ -1,7 +1,6 @@
 <?php
 namespace Misuzu;
 
-use Index\Environment;
 use Index\Data\IDbConnection;
 use Index\Data\Migration\{IDbMigrationRepo,DbMigrationManager,FsDbMigrationRepo};
 use Sasae\SasaeEnvironment;
@@ -191,7 +190,7 @@ class MisuzuContext {
             ['eeprom.appmsgs:s', '', 'eeprom_app_messages'],
         ]);
 
-        $isDebug = Environment::isDebug();
+        $isDebug = MSZ_DEBUG;
         $globals['site_info'] = $this->siteInfo;
         $globals['auth_info'] = $this->authInfo;
         $globals['active_ban_info'] = $this->usersCtx->tryGetActiveBan($this->authInfo->getUserInfo());
@@ -283,8 +282,7 @@ class MisuzuContext {
             $this->config->scopeTo('impersonate'),
             $this->urls,
             $this->usersCtx,
-            $this->authCtx,
-            $this->authInfo
+            $this->authCtx
         ));
 
         $routingCtx->register(new LegacyRoutes($this->urls));
diff --git a/src/MisuzuSasaeExtension.php b/src/MisuzuSasaeExtension.php
index 527dfdb..c92c466 100644
--- a/src/MisuzuSasaeExtension.php
+++ b/src/MisuzuSasaeExtension.php
@@ -1,10 +1,11 @@
 <?php
 namespace Misuzu;
 
-use Index\DateTime;
+use DateTimeInterface;
 use Misuzu\MisuzuContext;
 use Misuzu\Tools;
 use Misuzu\Parsers\Parser;
+use Carbon\CarbonImmutable;
 use Twig\Extension\AbstractExtension;
 use Twig\TwigFilter;
 use Twig\TwigFunction;
@@ -46,30 +47,18 @@ final class MisuzuSasaeExtension extends AbstractExtension {
         return $this->assets?->{$name} ?? '';
     }
 
-    public function timeFormat(DateTime|string|int|null $dateTime): string {
+    public function timeFormat(DateTimeInterface|string|int|null $dateTime): string {
         if($dateTime === null)
             return 'never';
 
         if(is_string($dateTime))
-            $dateTime = new DateTime($dateTime);
+            $dateTime = new CarbonImmutable($dateTime);
         elseif(is_int($dateTime))
-            $dateTime = DateTime::fromUnixTimeSeconds($dateTime);
+            $dateTime = CarbonImmutable::createFromTimestampUTC($dateTime);
+        elseif(!($dateTime instanceof CarbonImmutable))
+            $dateTime = new CarbonImmutable($dateTime);
 
-        $string = '';
-        $now = DateTime::now();
-
-        $isDiffYear = $now->getYear() !== $dateTime->getYear();
-        if($isDiffYear || $now->getMonth() !== $dateTime->getMonth() || $now->getDay() !== $dateTime->getDay()) {
-            $string .= $dateTime->format('M jS');
-            if($isDiffYear)
-                $string .= $dateTime->format(' Y');
-            $string .= ', ';
-        }
-
-        $string .= $dateTime->format('G:i ');
-        $string .= $dateTime->isUTC() ? 'UTC' : $dateTime->format('T');
-
-        return $string;
+        return $dateTime->diffForHumans();
     }
 
     public function getHeaderMenu(): array {
diff --git a/src/News/News.php b/src/News/News.php
index 37d4327..877ac8b 100644
--- a/src/News/News.php
+++ b/src/News/News.php
@@ -3,7 +3,7 @@ namespace Misuzu\News;
 
 use InvalidArgumentException;
 use RuntimeException;
-use Index\DateTime;
+use DateTimeInterface;
 use Index\Data\DbStatementCache;
 use Index\Data\IDbConnection;
 use Index\Data\IDbResult;
@@ -286,14 +286,14 @@ class News {
         string $body,
         bool $featured = false,
         UserInfo|string|null $userInfo = null,
-        DateTime|int|null $schedule = null
+        DateTimeInterface|int|null $schedule = null
     ): NewsPostInfo {
         if($categoryInfo instanceof NewsCategoryInfo)
             $categoryInfo = $categoryInfo->getId();
         if($userInfo instanceof UserInfo)
             $userInfo = $userInfo->getId();
-        if($schedule instanceof DateTime)
-            $schedule = $schedule->getUnixTimeSeconds();
+        if($schedule instanceof DateTimeInterface)
+            $schedule = (int)$schedule->format('U');
 
         $title = trim($title);
         if(empty($title))
@@ -351,7 +351,7 @@ class News {
         ?bool $featured = null,
         bool $updateUserInfo = false,
         UserInfo|string|null $userInfo = null,
-        DateTime|int|null $schedule = null
+        DateTimeInterface|int|null $schedule = null
     ): void {
         if($postInfo instanceof NewsPostInfo)
             $postInfo = $postInfo->getId();
@@ -359,8 +359,8 @@ class News {
             $categoryInfo = $categoryInfo->getId();
         if($userInfo instanceof UserInfo)
             $userInfo = $userInfo->getId();
-        if($schedule instanceof DateTime)
-            $schedule = $schedule->getUnixTimeSeconds();
+        if($schedule instanceof DateTimeInterface)
+            $schedule = (int)$schedule->format('U');
 
         if($title !== null) {
             $title = trim($title);
diff --git a/src/News/NewsCategoryInfo.php b/src/News/NewsCategoryInfo.php
index f3d07fa..eb49989 100644
--- a/src/News/NewsCategoryInfo.php
+++ b/src/News/NewsCategoryInfo.php
@@ -1,7 +1,7 @@
 <?php
 namespace Misuzu\News;
 
-use Index\DateTime;
+use Carbon\CarbonImmutable;
 use Index\Data\IDbResult;
 
 class NewsCategoryInfo {
@@ -45,8 +45,8 @@ class NewsCategoryInfo {
         return $this->created;
     }
 
-    public function getCreatedAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->created);
+    public function getCreatedAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->created);
     }
 
     public function getPostsCount(): int {
diff --git a/src/News/NewsPostInfo.php b/src/News/NewsPostInfo.php
index 81e0d9a..c2da950 100644
--- a/src/News/NewsPostInfo.php
+++ b/src/News/NewsPostInfo.php
@@ -1,7 +1,7 @@
 <?php
 namespace Misuzu\News;
 
-use Index\DateTime;
+use Carbon\CarbonImmutable;
 use Index\Data\IDbResult;
 
 class NewsPostInfo {
@@ -84,8 +84,8 @@ class NewsPostInfo {
         return $this->scheduled;
     }
 
-    public function getScheduledAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->scheduled);
+    public function getScheduledAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->scheduled);
     }
 
     public function isPublished(): bool {
@@ -96,16 +96,16 @@ class NewsPostInfo {
         return $this->created;
     }
 
-    public function getCreatedAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->created);
+    public function getCreatedAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->created);
     }
 
     public function getUpdatedTime(): int {
         return $this->updated;
     }
 
-    public function getUpdatedAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->updated);
+    public function getUpdatedAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->updated);
     }
 
     public function isEdited(): bool {
@@ -120,7 +120,7 @@ class NewsPostInfo {
         return $this->deleted;
     }
 
-    public function getDeletedAt(): ?DateTime {
-        return $this->deleted === null ? null : DateTime::fromUnixTimeSeconds($this->deleted);
+    public function getDeletedAt(): ?CarbonImmutable {
+        return $this->deleted === null ? null : CarbonImmutable::createFromTimestampUTC($this->deleted);
     }
 }
diff --git a/src/News/NewsRoutes.php b/src/News/NewsRoutes.php
index 95f7bb0..fa1bd49 100644
--- a/src/News/NewsRoutes.php
+++ b/src/News/NewsRoutes.php
@@ -2,7 +2,6 @@
 namespace Misuzu\News;
 
 use RuntimeException;
-use Index\DateTime;
 use Index\Data\{DbTools,IDbConnection};
 use Index\Http\Routing\{HttpGet,RouteHandler};
 use Misuzu\{Pagination,SiteInfo,Template};
diff --git a/src/Perms/Permissions.php b/src/Perms/Permissions.php
index 64a0b1c..e5677ba 100644
--- a/src/Perms/Permissions.php
+++ b/src/Perms/Permissions.php
@@ -4,8 +4,7 @@ namespace Misuzu\Perms;
 use stdClass;
 use InvalidArgumentException;
 use RuntimeException;
-use Index\DateTime;
-use Index\Environment;
+use Index\XDateTime;
 use Index\Data\DbStatementCache;
 use Index\Data\DbTools;
 use Index\Data\IDbConnection;
@@ -371,10 +370,10 @@ class Permissions {
     }
 
     private static function precalculatePermissionsLog(string $fmt, ...$args): void {
-        if(!Environment::isConsole())
+        if(!MSZ_CLI)
             return;
 
-        echo DateTime::now()->format('[H:i:s.u] ');
+        echo XDateTime::now()->format('[H:i:s.u] ');
         vprintf($fmt, $args);
         echo PHP_EOL;
     }
diff --git a/src/TOTPGenerator.php b/src/TOTPGenerator.php
index 393f30c..2e2f8fd 100644
--- a/src/TOTPGenerator.php
+++ b/src/TOTPGenerator.php
@@ -2,7 +2,7 @@
 namespace Misuzu;
 
 use InvalidArgumentException;
-use Index\Serialisation\Base32;
+use Index\Base32;
 
 class TOTPGenerator {
     public const DIGITS = 6;
diff --git a/src/Users/BanInfo.php b/src/Users/BanInfo.php
index 9e9eee9..6db545c 100644
--- a/src/Users/BanInfo.php
+++ b/src/Users/BanInfo.php
@@ -1,7 +1,7 @@
 <?php
 namespace Misuzu\Users;
 
-use Index\DateTime;
+use Carbon\CarbonImmutable;
 use Index\Data\IDbResult;
 
 class BanInfo {
@@ -69,8 +69,8 @@ class BanInfo {
         return $this->created;
     }
 
-    public function getCreatedAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->created);
+    public function getCreatedAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->created);
     }
 
     public function isPermanent(): bool {
@@ -81,8 +81,8 @@ class BanInfo {
         return $this->expires;
     }
 
-    public function getExpiresAt(): ?DateTime {
-        return $this->expires === null ? null : DateTime::fromUnixTimeSeconds($this->expires);
+    public function getExpiresAt(): ?CarbonImmutable {
+        return $this->expires === null ? null : CarbonImmutable::createFromTimestampUTC($this->expires);
     }
 
     public function isActive(): bool {
diff --git a/src/Users/Bans.php b/src/Users/Bans.php
index be7c5c8..f251b81 100644
--- a/src/Users/Bans.php
+++ b/src/Users/Bans.php
@@ -3,11 +3,11 @@ namespace Misuzu\Users;
 
 use InvalidArgumentException;
 use RuntimeException;
-use Index\DateTime;
+use DateTimeInterface;
+use Misuzu\Pagination;
 use Index\Data\DbStatementCache;
 use Index\Data\DbTools;
 use Index\Data\IDbConnection;
-use Misuzu\Pagination;
 
 class Bans {
     public const SEVERITY_MAX = 10;
@@ -152,7 +152,7 @@ class Bans {
 
     public function createBan(
         UserInfo|string $userInfo,
-        DateTime|int|null $expires,
+        DateTimeInterface|int|null $expires,
         string $publicReason,
         string $privateReason,
         int $severity = self::SEVERITY_DEFAULT,
@@ -164,8 +164,8 @@ class Bans {
             $userInfo = $userInfo->getId();
         if($modInfo instanceof UserInfo)
             $modInfo = $modInfo->getId();
-        if($expires instanceof DateTime)
-            $expires = $expires->getUnixTimeSeconds();
+        if($expires instanceof DateTimeInterface)
+            $expires = (int)$expires->format('U');
 
         $stmt = $this->cache->get('INSERT INTO msz_users_bans (user_id, mod_id, ban_severity, ban_reason_public, ban_reason_private, ban_expires) VALUES (?, ?, ?, ?, ?, FROM_UNIXTIME(?))');
         $stmt->addParameter(1, $userInfo);
diff --git a/src/Users/ModNoteInfo.php b/src/Users/ModNoteInfo.php
index c25b621..4a4c2f9 100644
--- a/src/Users/ModNoteInfo.php
+++ b/src/Users/ModNoteInfo.php
@@ -1,7 +1,7 @@
 <?php
 namespace Misuzu\Users;
 
-use Index\DateTime;
+use Carbon\CarbonImmutable;
 use Index\Data\IDbResult;
 
 class ModNoteInfo {
@@ -45,8 +45,8 @@ class ModNoteInfo {
         return $this->created;
     }
 
-    public function getCreatedAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->created);
+    public function getCreatedAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->created);
     }
 
     public function getTitle(): string {
diff --git a/src/Users/RoleInfo.php b/src/Users/RoleInfo.php
index 5367cad..db479a6 100644
--- a/src/Users/RoleInfo.php
+++ b/src/Users/RoleInfo.php
@@ -2,7 +2,7 @@
 namespace Misuzu\Users;
 
 use Stringable;
-use Index\DateTime;
+use Carbon\CarbonImmutable;
 use Index\Colour\Colour;
 use Index\Data\IDbResult;
 
@@ -89,8 +89,8 @@ class RoleInfo implements Stringable {
         return $this->created;
     }
 
-    public function getCreatedAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->created);
+    public function getCreatedAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->created);
     }
 
     public function __toString(): string {
diff --git a/src/Users/UserInfo.php b/src/Users/UserInfo.php
index 5484a21..0604d97 100644
--- a/src/Users/UserInfo.php
+++ b/src/Users/UserInfo.php
@@ -1,12 +1,11 @@
 <?php
 namespace Misuzu\Users;
 
-use Index\DateTime;
-use Index\TimeZoneInfo;
+use Misuzu\Parsers\Parser;
+use Carbon\CarbonImmutable;
 use Index\Colour\Colour;
 use Index\Data\IDbResult;
 use Index\Net\IPAddress;
-use Misuzu\Parsers\Parser;
 
 class UserInfo {
     public function __construct(
@@ -131,8 +130,8 @@ class UserInfo {
         return $this->created;
     }
 
-    public function getCreatedAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->created);
+    public function getCreatedAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->created);
     }
 
     public function hasLastActive(): bool {
@@ -143,8 +142,8 @@ class UserInfo {
         return $this->lastActive;
     }
 
-    public function getLastActiveAt(): ?DateTime {
-        return $this->lastActive === null ? null : DateTime::fromUnixTimeSeconds($this->lastActive);
+    public function getLastActiveAt(): ?CarbonImmutable {
+        return $this->lastActive === null ? null : CarbonImmutable::createFromTimestampUTC($this->lastActive);
     }
 
     public function isDeleted(): bool {
@@ -155,8 +154,8 @@ class UserInfo {
         return $this->deleted;
     }
 
-    public function getDeletedAt(): ?DateTime {
-        return $this->deleted === null ? null : DateTime::fromUnixTimeSeconds($this->deleted);
+    public function getDeletedAt(): ?CarbonImmutable {
+        return $this->deleted === null ? null : CarbonImmutable::createFromTimestampUTC($this->deleted);
     }
 
     public function hasDisplayRoleId(): bool {
@@ -231,15 +230,15 @@ class UserInfo {
         return $this->birthdate;
     }
 
-    public function getBirthdate(): ?DateTime {
-        return $this->birthdate === null ? null : DateTime::createFromFormat('Y-m-d', $this->birthdate, TimeZoneInfo::utc());
+    public function getBirthdate(): ?CarbonImmutable {
+        return $this->birthdate === null ? null : CarbonImmutable::createFromFormat('Y-m-d', $this->birthdate, 'UTC');
     }
 
     public function getAge(): int {
         $birthdate = $this->getBirthdate();
-        if($birthdate === null || $birthdate->getYear() < 1900)
+        if($birthdate === null || (int)$birthdate->format('Y') < 1900)
             return -1;
-        return (int)$birthdate->diff(DateTime::now())->format('%y');
+        return (int)$birthdate->diff(CarbonImmutable::now())->format('%y');
     }
 
     public function hasBackgroundSettings(): bool {
diff --git a/src/Users/Users.php b/src/Users/Users.php
index 93f107e..c110f3f 100644
--- a/src/Users/Users.php
+++ b/src/Users/Users.php
@@ -3,7 +3,7 @@ namespace Misuzu\Users;
 
 use InvalidArgumentException;
 use RuntimeException;
-use Index\DateTime;
+use DateTimeInterface;
 use Index\XString;
 use Index\Colour\Colour;
 use Index\Data\DbStatementCache;
@@ -46,7 +46,7 @@ class Users {
         UserInfo|string|null $after = null,
         ?int $lastActiveInMinutes = null,
         ?int $newerThanDays = null,
-        ?DateTime $birthdate = null,
+        ?DateTimeInterface $birthdate = null,
         ?bool $deleted = null
     ): int {
         if($roleInfo instanceof RoleInfo)
@@ -106,7 +106,7 @@ class Users {
         UserInfo|string|null $after = null,
         ?int $lastActiveInMinutes = null,
         ?int $newerThanDays = null,
-        ?DateTime $birthdate = null,
+        ?DateTimeInterface $birthdate = null,
         ?bool $deleted = null,
         ?string $orderBy = null,
         ?bool $reverseOrder = null,
diff --git a/src/Users/WarningInfo.php b/src/Users/WarningInfo.php
index 3f4d7e1..61eaa73 100644
--- a/src/Users/WarningInfo.php
+++ b/src/Users/WarningInfo.php
@@ -1,7 +1,7 @@
 <?php
 namespace Misuzu\Users;
 
-use Index\DateTime;
+use Carbon\CarbonImmutable;
 use Index\Data\IDbResult;
 
 class WarningInfo {
@@ -55,7 +55,7 @@ class WarningInfo {
         return $this->created;
     }
 
-    public function getCreatedAt(): DateTime {
-        return DateTime::fromUnixTimeSeconds($this->created);
+    public function getCreatedAt(): CarbonImmutable {
+        return CarbonImmutable::createFromTimestampUTC($this->created);
     }
 }