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# gmdate

(PHP 3, PHP 4, PHP 5)

gmdate -- Format a GMT/UTC date/time

## Description

string gmdate ( string format [, int timestamp] )

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

## Parameters

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().

## Return Values

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.

## ChangeLog

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.

## �d��

範例 1. gmdate() example

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)); ?>`

## �Ѧ�

date()
mktime()
gmmktime()
strftime()

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