diff --git a/lib/FWIF/FWIF.php b/lib/FWIF/FWIF.php
index 60c40c9..2b8d2a6 100644
--- a/lib/FWIF/FWIF.php
+++ b/lib/FWIF/FWIF.php
@@ -288,21 +288,21 @@ class FWIF {
         if($subYear)
             $year = ~$year;
         
-        $ymdfh  = $subYear ? self::DATETIME_YEAR_SIGN : 0;
-        $ymdfh |= ($year  & self::DATETIME_YEAR_MASK)  << self::DATETIME_YEAR_SHIFT;
-        $ymdfh |= ($month & self::DATETIME_MONTH_MASK) << self::DATETIME_MONTH_SHIFT;
-        $ymdfh |= ($day   & self::DATETIME_DAY_MASK)   << self::DATETIME_DAY_SHIFT;
-        $ymdfh |= ($hours & self::DATETIME_HOUR_MASK);
+        $ymdh  = $subYear ? self::DATETIME_YEAR_SIGN : 0;
+        $ymdh |= ($year  & self::DATETIME_YEAR_MASK)  << self::DATETIME_YEAR_SHIFT;
+        $ymdh |= ($month & self::DATETIME_MONTH_MASK) << self::DATETIME_MONTH_SHIFT;
+        $ymdh |= ($day   & self::DATETIME_DAY_MASK)   << self::DATETIME_DAY_SHIFT;
+        $ymdh |= ($hours & self::DATETIME_HOUR_MASK);
 
         $mins   = (int)$dt->format('i');
         $secs   = (int)$dt->format('s');
         $millis = ($flags & self::DISCARD_MILLISECONDS) ? 0 : (int)$dt->format('v');
 
         if($mins > 0 || $secs > 0 || $millis > 0) {
-            $ymdfh |= self::DATETIME_FLAG_TIME;
-            $msw    = 0;
-            $msw   |= ($mins  & self::DATETIME_MINS_MASK) << self::DATETIME_MINS_SHIFT;
-            $msw   |= ($secs  & self::DATETIME_SECS_MASK) << self::DATETIME_SECS_SHIFT;
+            $ymdh |= self::DATETIME_FLAG_TIME;
+            $msw   = 0;
+            $msw  |= ($mins  & self::DATETIME_MINS_MASK) << self::DATETIME_MINS_SHIFT;
+            $msw  |= ($secs  & self::DATETIME_SECS_MASK) << self::DATETIME_SECS_SHIFT;
 
             if($millis > 0) {
                 $msw |=  self::DATETIME_FLAG_MILLI;
@@ -311,8 +311,8 @@ class FWIF {
             }
         }
 
-        $packed = pack('N', $ymdfh);
-        if($ymdfh & self::DATETIME_FLAG_TIME) {
+        $packed = pack('N', $ymdh);
+        if($ymdh & self::DATETIME_FLAG_TIME) {
             $packed .= pack('n', $msw);
             if($msw & self::DATETIME_FLAG_MILLI)
                 $packed .= chr($w);
@@ -321,18 +321,18 @@ class FWIF {
         return $packed;
     }
     private static function decodeDateTime($data, int $flags): DateTimeInterface {
-        $ymdfh  = unpack('N', fread($data, 4))[1];
-        $hasMsw = $ymdfh & self::DATETIME_FLAG_TIME;
+        $ymdh  = unpack('N', fread($data, 4))[1];
+        $hasMsw = $ymdh & self::DATETIME_FLAG_TIME;
         $msw    = $hasMsw ? unpack('n', fread($data, 2))[1] : 0;
         $hasW   = $hasMsw && ($msw & self::DATETIME_FLAG_MILLI);
         $w      = $hasW   ? ord(fgetc($data)) : 0;
 
-        $year  = ($ymdfh >> self::DATETIME_YEAR_SHIFT)  & self::DATETIME_YEAR_MASK;
-        $month = ($ymdfh >> self::DATETIME_MONTH_SHIFT) & self::DATETIME_MONTH_MASK;
-        $day   = ($ymdfh >> self::DATETIME_DAY_SHIFT)   & self::DATETIME_DAY_MASK;
-        $hour  =  $ymdfh                                & self::DATETIME_HOUR_MASK;
+        $year  = ($ymdh >> self::DATETIME_YEAR_SHIFT)  & self::DATETIME_YEAR_MASK;
+        $month = ($ymdh >> self::DATETIME_MONTH_SHIFT) & self::DATETIME_MONTH_MASK;
+        $day   = ($ymdh >> self::DATETIME_DAY_SHIFT)   & self::DATETIME_DAY_MASK;
+        $hour  =  $ymdh                                & self::DATETIME_HOUR_MASK;
 
-        if($ymdfh & self::DATETIME_YEAR_SIGN)
+        if($ymdh & self::DATETIME_YEAR_SIGN)
             $year = ~$year;
         $dt = sprintf('%04d-%02d-%02dT%02d:', $year, $month, $day, $hour);
 
@@ -340,7 +340,7 @@ class FWIF {
             $mins = ($msw >> self::DATETIME_MINS_SHIFT) & self::DATETIME_MINS_MASK;
             $secs = ($msw >> self::DATETIME_SECS_SHIFT) & self::DATETIME_SECS_MASK;
             $dt  .= sprintf('%02d:%02d', $mins, $secs);
-            if($hasV) {
+            if($hasW) {
                 $millis  = ($msw << self::DATETIME_MILLI_HI_SHIFT) & self::DATETIME_MILLI_HI_MASK;
                 $millis |=  $w;
                 $dt .= sprintf('.%03d', $millis);