DateTime: fixed parsing 'ago' modifier [Closes #327]

Author: dg

src/Utils/DateTime.php

@@ -158,7 +158,7 @@ private function apply(string $datetime, $timezone = null, bool $ctr = false): v
 	{
 		$relPart = '';
 		$absPart = preg_replace_callback(
-			'/[+-]?\s*\d+\s+((microsecond|millisecond|[mµu]sec)s?|[mµ]s|sec(ond)?s?|min(ute)?s?|hours?)\b/iu',
+			'/[+-]?\s*\d+\s+((microsecond|millisecond|[mµu]sec)s?|[mµ]s|sec(ond)?s?|min(ute)?s?|hours?)(\s+ago)?\b/iu',
 			function ($m) use (&$relPart) {
 				$relPart .= $m[0] . ' ';
 				return '';

tests/Utils/DateTime.modify.phpt

@@ -157,6 +157,11 @@ test('Complex and varied format strings', function () {
 	// 'first day of may' -> 2024-05-01 00:00 | 'noon' -> 2024-05-01 12:00
 	$dt->modify('first day of may 2024 noon');
 	Assert::same('2024-05-01 12:00:00 CEST (+02:00)', $dt->format('Y-m-d H:i:s T (P)'), 'Chained textual modifiers');
+
+	// ago
+	$dt = new DateTime('2024-03-10 10:00:00'); // CET
+	$dt->modify('12 minutes ago');
+	Assert::same('2024-03-10 09:48:00 CET (+01:00)', $dt->format('Y-m-d H:i:s T (P)'), 'Ago modifier');
 });