--- /dev/null
+--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)