Fixed a few DST changeover issues.

Author: derickr

ext/date/lib/interval.c

@@ -111,6 +111,14 @@ timelib_time *timelib_add(timelib_time *old_time, timelib_rel_time *interval)
 	t->sse_uptodate = 0;
 
 	timelib_update_ts(t, NULL);
+
+//	printf("%lld %lld %d\n", old_time->dst, t->dst, (t->sse - old_time->sse));
+	/* Adjust for backwards DST changeover */
+	if (old_time->dst == 1 && t->dst == 0 && !interval->y && !interval->m && !interval->d) {
+		t->sse -= old_time->z;
+		t->sse += t->z;
+	}
+
 	timelib_update_from_sse(t);
 	t->have_relative = 0;
 
@@ -137,6 +145,18 @@ timelib_time *timelib_sub(timelib_time *old_time, timelib_rel_time *interval)
 	t->sse_uptodate = 0;
 
 	timelib_update_ts(t, NULL);
+
+	/* Adjust for backwards DST changeover */
+	if (old_time->dst == 1 && t->dst == 0 && !interval->y && !interval->m && !interval->d) {
+		t->sse -= old_time->z;
+		t->sse += t->z;
+	}
+	/* Adjust for forwards DST changeover */
+	if (old_time->dst == 0 && t->dst == 1 && !interval->y && !interval->m && !interval->d ) {
+		t->sse -= old_time->z;
+		t->sse += t->z;
+	}
+
 	timelib_update_from_sse(t);
 
 	t->have_relative = 0;

ext/date/tests/rfc-datetime_and_daylight_saving_time-type3-ba.phpt

@@ -90,7 +90,7 @@ ba4 2010-11-06 04:30:00 EDT America/New_York + PT23H = 2010-11-07 02:30:00 EST A
 ba5 2010-11-06 04:30:00 EDT America/New_York + PT22H = 2010-11-07 01:30:00 EST America/New_York
 ba6 2010-11-06 04:30:00 EDT America/New_York + PT21H = 2010-11-07 01:30:00 EDT America/New_York
 ba7 2010-11-06 01:30:00 EDT America/New_York + P1D = 2010-11-07 01:30:00 EDT America/New_York
-ba8 2010-11-06 01:30:00 EDT America/New_York + P1DT1H = 2010-11-07 01:30:00 EST America/New_York
+ba8 2010-11-06 01:30:00 EDT America/New_York + P1DT1H = 2010-11-07 02:30:00 EST America/New_York
 ba9 2010-11-06 04:30:00 EDT America/New_York + PT25H = 2010-11-07 04:30:00 EST America/New_York
 ba10 2010-11-06 03:30:00 EDT America/New_York + P1D = 2010-11-07 03:30:00 EST America/New_York
 ba11 2010-11-06 02:30:00 EDT America/New_York + P1D = 2010-11-07 02:30:00 EST America/New_York

ext/date/tests/rfc-datetime_and_daylight_saving_time-type3-bd2.phpt

@@ -25,7 +25,7 @@ $end   = new DateTime('2010-11-07 05:30:00');
 $end->setTimeZone($tz);
 $start = new DateTime('2010-11-06 04:30:59');
 echo 'bd0 ' . $end->format($date_format) . ' - ' . $start->format($date_format)
-	. ' = ' . $start->diff($end)->format('PT%hH%iM%sS') . "\n";
+	. ' = ' . $start->diff($end)->format('P%dDT%hH%iM%sS') . "\n";
 
 $end   = new DateTime('2010-11-07 01:30:00 EST');
 $end->setTimeZone($tz);

ext/date/tests/rfc-datetime_and_daylight_saving_time-type3-bs.phpt

@@ -6,6 +6,7 @@ Daniel Convissor <danielc@php.net>
 <?php
 
 date_default_timezone_set('America/New_York');
+$tz = new DateTimeZone('America/New_York');
 $date_format = 'Y-m-d H:i:s T e';
 $interval_format = 'P%dDT%hH';
 

ext/date/tests/rfc-datetime_and_daylight_saving_time-type3-fs.phpt

@@ -62,4 +62,4 @@ fs3 2010-03-14 03:30:00 EDT America/New_York - PT22H = 2010-03-13 04:30:00 EST A
 fs4 2010-03-14 01:30:00 EST America/New_York - PT21H = 2010-03-13 04:30:00 EST America/New_York
 fs5 2010-03-14 01:30:00 EST America/New_York - P1D = 2010-03-13 01:30:00 EST America/New_York
 fs6 2010-03-15 03:30:00 EDT America/New_York - P1D = 2010-03-14 03:30:00 EDT America/New_York
-fs7 2010-03-15 03:30:00 EDT America/New_York - P1D = 2010-03-14 03:30:00 EDT America/New_York
+fs7 2010-03-15 02:30:00 EDT America/New_York - P1D = 2010-03-14 03:30:00 EDT America/New_York