Refactor datetime_convert into Temporal::convert

- Changed parameter order to save space
- Refactor select_timezone into Temporal::getTimezoneSelect
- Refactor field_timezone into Temporal::getTimezoneField

src/Util/ParseUrl.php

@@ -73,7 +73,8 @@ class ParseUrl
 			[
 				'url' => normalise_link($url), 'guessing' => !$no_guessing,
 				'oembed' => $do_oembed, 'content' => serialize($data),
-				'created' => datetime_convert()],
+				'created' => Temporal::convert()
+			],
 			true
 		);