Change getDateTime to DateTimeInterface

src/DegradedUuid.php

@@ -36,7 +36,7 @@ public function getDateTime()
         $time = $this->numberConverter->fromHex($this->getTimestampHex());
         $unixTime = $this->timeConverter->convertTime($time);
 
-        return new \DateTime("@{$unixTime}");
+        return new \DateTimeImmutable("@{$unixTime}");
     }
 
     /**

src/Uuid.php

@@ -351,7 +351,7 @@ public function getDateTime()
 
         $unixTime = $this->timeConverter->convertTime($this->getTimestamp());
 
-        return new \DateTime("@{$unixTime}");
+        return new \DateTimeImmutable("@{$unixTime}");
     }
 
     /**

src/UuidInterface.php

@@ -118,14 +118,14 @@ public function getClockSeqLowHex();
     public function getClockSequenceHex();
 
     /**
-     * Returns a PHP `DateTime` object representing the timestamp associated
+     * Returns a PHP object that implements `DateTimeInterface` representing the timestamp associated
      * with this UUID.
      *
      * The timestamp value is only meaningful in a time-based UUID, which
      * has version type 1. If this UUID is not a time-based UUID then
      * this method throws `UnsupportedOperationException`.
      *
-     * @return DateTime A PHP DateTime representation of the date
+     * @return \DateTimeInterface A PHP DateTimeImmutable representation of the date
      * @throws UnsupportedOperationException If this UUID is not a version 1 UUID
      * @throws UnsatisfiedDependencyException if called in a 32-bit system and
      *     `Moontoast\Math\BigNumber` is not present