서버의 분턴 변경시 '정확히' 현재 턴에 비례해서 변경되도록 변경

src/sammo/TimeUtil.php

@@ -58,7 +58,7 @@ class TimeUtil
         return $obj->format('Y-m-d H:i:s.u');
     }
 
-    public static function secondsToDateTime(float $fullSeconds): \DateTime{
+    public static function secondsToDateTime(float $fullSeconds, bool $isDateTimeImmutable=false): \DateTime{
         $seconds = floor($fullSeconds);
         $fraction = $fullSeconds - $seconds;
 
@@ -66,6 +66,11 @@ class TimeUtil
         $interval->s = $seconds;
         $interval->f = $fraction;
 
+        if($isDateTimeImmutable){
+            $dateTime = new \DateTimeImmutable("@0");
+            return $dateTime->add($interval);
+        }
+
         $dateTime = new \DateTime("@0");
         $dateTime->add($interval);
         return $dateTime;
@@ -77,8 +82,8 @@ class TimeUtil
         return static::secondsToDateTime($fullSeconds)->diff($d0);
     }
 
-    public static function DateTimeToSeconds(\DateTime $dateTime): float{
-        $dateBase = new \DateTime("@0");
+    public static function DateTimeToSeconds(\DateTimeInterface $dateTime): float{
+        $dateBase = new \DateTimeImmutable("@0");
 
         return static::DateIntervalToSeconds($dateTime->diff($dateBase));
     }