Fixed #81263: Wrong result from DateTimeImmutable::diff

Author: derickr

ext/date/tests/bug81263.phpt

@@ -0,0 +1,50 @@
+--TEST--
+Bug #81263 (Wrong result from DateTimeImmutable::diff)
+--FILE--
+<?php
+
+$dt1 = new DateTimeImmutable('2020-07-19 18:30:00', new DateTimeZone('Europe/Berlin'));
+$dt2 = new DateTimeImmutable('2020-07-19 16:30:00', new DateTimeZone('UTC'));
+
+print_r($dt2->diff($dt1));
+print_r($dt1->diff($dt2));
+?>
+--EXPECTF--
+DateInterval Object
+(
+    [y] => 0
+    [m] => 0
+    [d] => 0
+    [h] => 0
+    [i] => 0
+    [s] => 0
+    [f] => 0
+    [weekday] => 0
+    [weekday_behavior] => 0
+    [first_last_day_of] => 0
+    [invert] => 0
+    [days] => 0
+    [special_type] => 0
+    [special_amount] => 0
+    [have_weekday_relative] => 0
+    [have_special_relative] => 0
+)
+DateInterval Object
+(
+    [y] => 0
+    [m] => 0
+    [d] => 0
+    [h] => 0
+    [i] => 0
+    [s] => 0
+    [f] => 0
+    [weekday] => 0
+    [weekday_behavior] => 0
+    [first_last_day_of] => 0
+    [invert] => 1
+    [days] => 0
+    [special_type] => 0
+    [special_amount] => 0
+    [have_weekday_relative] => 0
+    [have_special_relative] => 0
+)