gmstrftime code on php

Description

string gmstrftime (string format [, int timestamp])

Behaves the same as strftime() except that the time returned is Greenwich Mean Time (GMT). For example, when run in Eastern Standard Time (GMT -0500), the first line below prints "Dec 31 1998 20:00:00", while the second prints "Jan 01 1999 01:00:00".
Example 1. Gmstrftime() example
setlocale ('LC_TIME', 'en_US'); echo strftime ("%b %d %Y %H:%M:%S", mktime (20,0,0,12,31,98))."\n"; echo gmstrftime ("%b %d %Y %H:%M:%S", mktime (20,0,0,12,31,98))."\n";