diff --git a/ext/date/lib/parse_date.c b/ext/date/lib/parse_date.c
index dd0984c8b6e..e08a794497c 100644
--- a/ext/date/lib/parse_date.c
+++ b/ext/date/lib/parse_date.c
@@ -1,4 +1,4 @@
-/* Generated by re2c 0.13.5 on Tue Jul 15 19:21:36 2008 */
+/* Generated by re2c 0.13.5 on Wed Jul 16 17:24:19 2008 */
 #line 1 "ext/date/lib/parse_date.re"
 /*
    +----------------------------------------------------------------------+
@@ -800,7 +800,7 @@ static long timelib_get_zone(char **ptr, int *dst, timelib_time *t, int *tz_not_
 		}
 #endif
 		/* If we have a TimeZone identifier to start with, use it */
-		if (strstr(tz_abbr, "/")) {
+		if (strstr(tz_abbr, "/") || strcmp(tz_abbr, "UTC") == 0) {
 			if ((res = timelib_parse_tzfile(tz_abbr, tzdb)) != NULL) {
 				t->tz_info = res;
 				t->zone_type = TIMELIB_ZONETYPE_ID;
diff --git a/ext/date/lib/parse_date.re b/ext/date/lib/parse_date.re
index 14bd7e88db4..2a66d51461c 100644
--- a/ext/date/lib/parse_date.re
+++ b/ext/date/lib/parse_date.re
@@ -798,7 +798,7 @@ static long timelib_get_zone(char **ptr, int *dst, timelib_time *t, int *tz_not_
 		}
 #endif
 		/* If we have a TimeZone identifier to start with, use it */
-		if (strstr(tz_abbr, "/")) {
+		if (strstr(tz_abbr, "/") || strcmp(tz_abbr, "UTC") == 0) {
 			if ((res = timelib_parse_tzfile(tz_abbr, tzdb)) != NULL) {
 				t->tz_info = res;
 				t->zone_type = TIMELIB_ZONETYPE_ID;
diff --git a/ext/date/tests/bug45529.phpt b/ext/date/tests/bug45529.phpt
new file mode 100644
index 00000000000..ce4bca96b37
--- /dev/null
+++ b/ext/date/tests/bug45529.phpt
@@ -0,0 +1,20 @@
+--TEST--
+Bug #45529 (UTC not properly recognised as timezone identifier while parsing)
+--FILE--
+<?php
+$tz1 = new DateTimeZone('UTC');
+$tz2 = date_create('UTC')->getTimeZone();
+echo $tz1->getName(), PHP_EOL;
+echo $tz2->getName(), PHP_EOL;
+$d = new DateTime('2008-01-01 12:00:00+0200');
+$d->setTimeZone($tz1);
+echo $d->format(DATE_ISO8601), PHP_EOL;
+$d = new DateTime('2008-01-01 12:00:00+0200');
+$d->setTimeZone($tz2);
+echo $d->format(DATE_ISO8601), PHP_EOL; 
+?>
+--EXPECT--
+UTC
+UTC
+2008-01-01T10:00:00+0000
+2008-01-01T10:00:00+0000