- Fixed bug where the DateTime object got changed while using date_diff().

ext/date/lib/interval.c

@@ -25,6 +25,7 @@ timelib_rel_time *timelib_diff(timelib_time *one, timelib_time *two)
 	timelib_rel_time *rt;
 	timelib_time *swp;
 	timelib_sll dst_h_corr = 0, dst_m_corr = 0;
+	timelib_time one_backup, two_backup;
 
 	rt = timelib_rel_time_ctor();
 	rt->invert = 0;
@@ -45,6 +46,10 @@ timelib_rel_time *timelib_diff(timelib_time *one, timelib_time *two)
 		dst_m_corr = ((two->z - one->z) % 3600) / 60;
 	}
 
+	/* Save old TZ info */
+	memcpy(&one_backup, one, sizeof(one_backup));
+	memcpy(&two_backup, two, sizeof(two_backup));
+
     timelib_apply_localtime(one, 0);
     timelib_apply_localtime(two, 0);
 
@@ -58,8 +63,9 @@ timelib_rel_time *timelib_diff(timelib_time *one, timelib_time *two)
 
 	timelib_do_rel_normalize(rt->invert ? one : two, rt);
 
-    timelib_apply_localtime(one, 1);
-    timelib_apply_localtime(two, 1);
+	/* Restore old TZ info */
+	memcpy(one, &one_backup, sizeof(one_backup));
+	memcpy(two, &two_backup, sizeof(two_backup));
 
 	return rt;
 }

ext/date/tests/date_diff1.phpt

@@ -0,0 +1,48 @@
+--TEST--
+Test for date_diff with timezone abbreviations.
+--INI--
+date.timezone=Europe/London
+--FILE--
+<?php
+$start = new DateTime('2010-10-04 02:18:48 EDT');
+$end   = new DateTime('2010-11-06 18:38:28 EDT');
+$int = $start->diff($end);
+var_dump($start);
+var_dump($end);
+var_dump($int);
+?>
+--EXPECT--
+object(DateTime)#1 (3) {
+  ["date"]=>
+  string(19) "2010-10-04 02:18:48"
+  ["timezone_type"]=>
+  int(2)
+  ["timezone"]=>
+  string(3) "EDT"
+}
+object(DateTime)#2 (3) {
+  ["date"]=>
+  string(19) "2010-11-06 18:38:28"
+  ["timezone_type"]=>
+  int(2)
+  ["timezone"]=>
+  string(3) "EDT"
+}
+object(DateInterval)#3 (8) {
+  ["y"]=>
+  int(0)
+  ["m"]=>
+  int(1)
+  ["d"]=>
+  int(2)
+  ["h"]=>
+  int(16)
+  ["i"]=>
+  int(19)
+  ["s"]=>
+  int(40)
+  ["invert"]=>
+  int(0)
+  ["days"]=>
+  int(33)
+}