diff --git a/ext/date/lib/parse_date.c b/ext/date/lib/parse_date.c
index 7cd3e5f45ca..f193ff4e664 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 Sun Mar  7 18:37:37 2010 */
+/* Generated by re2c 0.13.5 on Fri Mar 26 12:26:56 2010 */
 #line 1 "ext/date/lib/parse_date.re"
 /*
    +----------------------------------------------------------------------+
@@ -526,7 +526,7 @@ static long timelib_parse_tz_cor(char **ptr)
 	char *begin = *ptr, *end;
 	long  tmp;
 
-	while (**ptr != '\0') {
+	while (isdigit(**ptr) || **ptr == ':') {
 		++*ptr;
 	}
 	end = *ptr;
diff --git a/ext/date/lib/parse_date.re b/ext/date/lib/parse_date.re
index 59feef9eb37..4eae69376b9 100644
--- a/ext/date/lib/parse_date.re
+++ b/ext/date/lib/parse_date.re
@@ -524,7 +524,7 @@ static long timelib_parse_tz_cor(char **ptr)
 	char *begin = *ptr, *end;
 	long  tmp;
 
-	while (**ptr != '\0') {
+	while (isdigit(**ptr) || **ptr == ':') {
 		++*ptr;
 	}
 	end = *ptr;
diff --git a/ext/date/lib/parse_iso_intervals.c b/ext/date/lib/parse_iso_intervals.c
index cc58f1dc60b..9199faa79c1 100644
--- a/ext/date/lib/parse_iso_intervals.c
+++ b/ext/date/lib/parse_iso_intervals.c
@@ -1,4 +1,4 @@
-/* Generated by re2c 0.13.5 on Sun Mar  7 14:12:01 2010 */
+/* Generated by re2c 0.13.5 on Fri Mar 26 12:26:54 2010 */
 #line 1 "ext/date/lib/parse_iso_intervals.re"
 /*
    +----------------------------------------------------------------------+
@@ -183,7 +183,7 @@ static long timelib_parse_tz_cor(char **ptr)
 	char *begin = *ptr, *end;
 	long  tmp;
 
-	while (**ptr != '\0') {
+	while (isdigit(**ptr) || **ptr == ':') {
 		++*ptr;
 	}
 	end = *ptr;
diff --git a/ext/date/lib/parse_iso_intervals.re b/ext/date/lib/parse_iso_intervals.re
index eb861a1a6b3..bf2c287276f 100644
--- a/ext/date/lib/parse_iso_intervals.re
+++ b/ext/date/lib/parse_iso_intervals.re
@@ -181,7 +181,7 @@ static long timelib_parse_tz_cor(char **ptr)
 	char *begin = *ptr, *end;
 	long  tmp;
 
-	while (**ptr != '\0') {
+	while (isdigit(**ptr) || **ptr == ':') {
 		++*ptr;
 	}
 	end = *ptr;
diff --git a/ext/date/tests/bug51393.phpt b/ext/date/tests/bug51393.phpt
new file mode 100644
index 00000000000..c4c4d61a1e7
--- /dev/null
+++ b/ext/date/tests/bug51393.phpt
@@ -0,0 +1,73 @@
+--TEST--
+Bug #51393 (DateTime::createFromFormat() fails if format string contains timezone)
+--FILE--
+<?php
+$dt = DateTime::createFromFormat('O', '+0800');
+var_dump($dt->getOffset());
+
+$dt = DateTime::createFromFormat('P', '+08:00');
+var_dump($dt->getOffset());
+
+$dt = DateTime::createFromFormat('O', '-0800');
+var_dump($dt->getOffset());
+
+$dt = DateTime::createFromFormat('P', '-08:00');
+var_dump($dt->getOffset());
+
+$dt = DateTime::createFromFormat('[O]', '[+0800]');
+var_dump($dt->getOffset());
+
+$dt = DateTime::createFromFormat('[P]', '[+08:00]');
+var_dump($dt->getOffset());
+
+$dt = DateTime::createFromFormat('[O]', '[-0800]');
+var_dump($dt->getOffset());
+
+$dt = DateTime::createFromFormat('[P]', '[-08:00]');
+var_dump($dt->getOffset());
+
+$dt = DateTime::createFromFormat('O', 'GMT+0800');
+var_dump($dt->getOffset());
+
+$dt = DateTime::createFromFormat('P', 'GMT+08:00');
+var_dump($dt->getOffset());
+
+$dt = DateTime::createFromFormat('O', 'GMT-0800');
+var_dump($dt->getOffset());
+
+$dt = DateTime::createFromFormat('P', 'GMT-08:00');
+var_dump($dt->getOffset());
+
+$dt = DateTime::createFromFormat('[O]', '[GMT+0800]');
+var_dump($dt->getOffset());
+
+$dt = DateTime::createFromFormat('[P]', '[GMT+08:00]');
+var_dump($dt->getOffset());
+
+$dt = DateTime::createFromFormat('[O]', '[GMT-0800]');
+var_dump($dt->getOffset());
+
+$dt = DateTime::createFromFormat('[P]', '[GMT-08:00]');
+var_dump($dt->getOffset());
+
+$dt = DateTime::createFromFormat('O', 'invalid');
+var_dump($dt);
+?>
+--EXPECT--
+int(28800)
+int(28800)
+int(-28800)
+int(-28800)
+int(28800)
+int(28800)
+int(-28800)
+int(-28800)
+int(28800)
+int(28800)
+int(-28800)
+int(-28800)
+int(28800)
+int(28800)
+int(-28800)
+int(-28800)
+bool(false)