gmdate

Format a GMT/UTC date/time (PHP 4, PHP 5)
string gmdate ( string format [, int timestamp] )

Identical to the date() function except that the time returned is Greenwich Mean Time (GMT).

format: The format of the outputted date string. See the formatting options for the date() function.
timestamp: The optional timestamp parameter is an integer Unix timestamp that defaults to the current local time if a timestamp is not given. In other words, it defaults to the value of time().

Returns a formatted date string. If a non-numeric value is used for timestamp, FALSE is returned and an E_WARNING level error is emitted.

Version	Description
5.1.0	The valid range of a timestamp is typically from Fri, 13 Dec 1901 20:45:54 GMT to Tue, 19 Jan 2038 03:14:07 GMT. (These are the dates that correspond to the minimum and maximum values for a 32-bit signed integer). However, before PHP 5.1.0 this range was limited from 01-01-1970 to 19-01-2038 on some systems (e.g. Windows).
5.1.1	There are useful constants of standard date/time formats that can be used to specify the `format` parameter.

When run in Finland (GMT +0200), the first line below prints "Jan 01 1998 00:00:00", while the second prints "Dec 31 1997 22:00:00".

<?php

echo date("M d Y H:i:s", mktime(0, 0, 0, 1, 1, 1998));

echo gmdate("M d Y H:i:s", mktime(0, 0, 0, 1, 1, 1998));

?>

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