DateTime: refactoring

Author: dg

src/Utils/DateTime.php

@@ -96,10 +96,7 @@ public static function createFromFormat(
 		string|\DateTimeZone|null $timezone = null,
 	): static|false
 	{
-		if ($timezone === null) {
-			$timezone = new \DateTimeZone(date_default_timezone_get());
-
-		} elseif (is_string($timezone)) {
+		if (is_string($timezone)) {
 			$timezone = new \DateTimeZone($timezone);
 		}
 
@@ -149,7 +146,7 @@ public function setTime(int $hour, int $minute, int $second = 0, int $microsecon
 	 */
 	public static function relativeToSeconds(string $relativeTime): int
 	{
-		return (new \DateTimeImmutable('1970-01-01 ' . $relativeTime, new \DateTimeZone('UTC')))
+		return (new \DateTimeImmutable('@0 ' . $relativeTime))
 			->getTimestamp();
 	}