From f43f6fc39b92796aa934d4ae13675bb144d23435 Mon Sep 17 00:00:00 2001
From: Derick Rethans <github@derickrethans.nl>
Date: Wed, 18 May 2016 12:19:11 +0100
Subject: [PATCH] Fixed bug #63740 (strtotime seems to use both sunday and
 monday as start of week)

---
 NEWS                         |  2 ++
 ext/date/lib/timelib.c       | 58 ++++++++++++++++++------------------
 ext/date/lib/timelib.h       |  4 +--
 ext/date/lib/tm2unixtime.c   | 10 ++++++-
 ext/date/tests/bug63740.phpt | 41 +++++++++++++++++++++++++
 5 files changed, 83 insertions(+), 32 deletions(-)
 create mode 100644 ext/date/tests/bug63740.phpt

diff --git a/NEWS b/NEWS
index 3cf7aa2927..4be12a5547 100644
--- a/NEWS
+++ b/NEWS
@@ -30,6 +30,8 @@ PHP                                                                        NEWS
     (Michael Sierks)    
 
 - Date:
+  . Fixed bug #63740 (strtotime seems to use both sunday and monday as start of
+    week). (Derick)
   . Fixed bug #71889 (DateInterval::format Segmentation fault). (Thomas Punt)
 
 - EXIF:
diff --git a/ext/date/lib/timelib.c b/ext/date/lib/timelib.c
index b938d9f998..b9fb66f00f 100644
--- a/ext/date/lib/timelib.c
+++ b/ext/date/lib/timelib.c
@@ -310,33 +310,33 @@ void timelib_dump_rel_time(timelib_rel_time *d)
 
 timelib_long timelib_parse_tz_cor(char **ptr)
 {
-        char *begin = *ptr, *end;
-        timelib_long  tmp;
-
-        while (isdigit(**ptr) || **ptr == ':') {
-                ++*ptr;
-        }
-        end = *ptr;
-        switch (end - begin) {
-                case 1:
-                case 2:
-                        return HOUR(strtol(begin, NULL, 10));
-                        break;
-                case 3:
-                case 4:
-                        if (begin[1] == ':') {
-                                tmp = HOUR(strtol(begin, NULL, 10)) + strtol(begin + 2, NULL, 10);
-                                return tmp;
-                        } else if (begin[2] == ':') {
-                                tmp = HOUR(strtol(begin, NULL, 10)) + strtol(begin + 3, NULL, 10);
-                                return tmp;
-                        } else {
-                                tmp = strtol(begin, NULL, 10);
-                                return HOUR(tmp / 100) + tmp % 100;
-                        }
-                case 5:
-                        tmp = HOUR(strtol(begin, NULL, 10)) + strtol(begin + 3, NULL, 10);
-                        return tmp;
-        }
-        return 0;
+	char *begin = *ptr, *end;
+	timelib_long  tmp;
+
+	while (isdigit(**ptr) || **ptr == ':') {
+		++*ptr;
+	}
+	end = *ptr;
+	switch (end - begin) {
+		case 1: /* H */
+		case 2: /* HH */
+			return HOUR(strtol(begin, NULL, 10));
+			break;
+		case 3: /* H:M */
+		case 4: /* H:MM, HH:M, HHMM */
+			if (begin[1] == ':') {
+				tmp = HOUR(strtol(begin, NULL, 10)) + strtol(begin + 2, NULL, 10);
+				return tmp;
+			} else if (begin[2] == ':') {
+				tmp = HOUR(strtol(begin, NULL, 10)) + strtol(begin + 3, NULL, 10);
+				return tmp;
+			} else {
+				tmp = strtol(begin, NULL, 10);
+				return HOUR(tmp / 100) + tmp % 100;
+			}
+		case 5: /* HH:MM */
+			tmp = HOUR(strtol(begin, NULL, 10)) + strtol(begin + 3, NULL, 10);
+			return tmp;
+	}
+	return 0;
 }
diff --git a/ext/date/lib/timelib.h b/ext/date/lib/timelib.h
index fe1069bdde..9a59d89770 100644
--- a/ext/date/lib/timelib.h
+++ b/ext/date/lib/timelib.h
@@ -38,8 +38,8 @@
 # define timelib_free    free
 #endif
 
-#define TIMELIB_VERSION 201502
-#define TIMELIB_ASCII_VERSION "2015.02"
+#define TIMELIB_VERSION 201602
+#define TIMELIB_ASCII_VERSION "2016.02"
 
 #define TIMELIB_NONE             0x00
 #define TIMELIB_OVERRIDE_TIME    0x01
diff --git a/ext/date/lib/tm2unixtime.c b/ext/date/lib/tm2unixtime.c
index 414cf13082..57e0cef1be 100644
--- a/ext/date/lib/tm2unixtime.c
+++ b/ext/date/lib/tm2unixtime.c
@@ -152,9 +152,17 @@ static void do_adjust_for_weekday(timelib_time* time)
 	current_dow = timelib_day_of_week(time->y, time->m, time->d);
 	if (time->relative.weekday_behavior == 2)
 	{
-		if (time->relative.weekday == 0) {
+		/* To make "this week" work, where the current DOW is a "sunday" */
+		if (current_dow == 0 && time->relative.weekday != 0) {
+			time->relative.weekday = -6;
+		}
+
+		/* To make "sunday this week" work, where the current DOW is not a
+		 * "sunday" */
+		if (time->relative.weekday == 0 && current_dow != 0) {
 			time->relative.weekday = 7;
 		}
+
 		time->d -= current_dow;
 		time->d += time->relative.weekday;
 		return;
diff --git a/ext/date/tests/bug63740.phpt b/ext/date/tests/bug63740.phpt
new file mode 100644
index 0000000000..18c5a57d77
--- /dev/null
+++ b/ext/date/tests/bug63740.phpt
@@ -0,0 +1,41 @@
+--TEST--
+Bug #63740 (strtotime seems to use both sunday and monday as start of week)
+--FILE--
+<?php
+$dates = [
+	'2015-07-04',
+	'2015-07-05',
+	'2015-07-06',
+	'2015-07-07',
+	'2015-07-08',
+	'2015-07-09',
+	'2015-07-10',
+	'2015-07-11',
+	'2015-07-12',
+	'2015-07-13',
+	'2015-07-14',
+];
+
+foreach ( $dates as $date )
+{
+	$dt = new DateTimeImmutable( "$date 00:00 UTC" );
+
+	echo $dt->format( "D Y-m-d H:i" ), " → ";
+
+	$dtn = $dt->modify( "this week" );
+
+	echo $dtn->format( "D Y-m-d H:i" ), "\n";
+}
+?>
+--EXPECT--
+Sat 2015-07-04 00:00 → Mon 2015-06-29 00:00
+Sun 2015-07-05 00:00 → Mon 2015-06-29 00:00
+Mon 2015-07-06 00:00 → Mon 2015-07-06 00:00
+Tue 2015-07-07 00:00 → Mon 2015-07-06 00:00
+Wed 2015-07-08 00:00 → Mon 2015-07-06 00:00
+Thu 2015-07-09 00:00 → Mon 2015-07-06 00:00
+Fri 2015-07-10 00:00 → Mon 2015-07-06 00:00
+Sat 2015-07-11 00:00 → Mon 2015-07-06 00:00
+Sun 2015-07-12 00:00 → Mon 2015-07-06 00:00
+Mon 2015-07-13 00:00 → Mon 2015-07-13 00:00
+Tue 2015-07-14 00:00 → Mon 2015-07-13 00:00
-- 
2.40.0