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# gmmktime

(PHP 3, PHP 4, PHP 5)

gmmktime -- Get Unix timestamp for a GMT date

## Description

int gmmktime ( [int hour [, int minute [, int second [, int month [, int day [, int year [, int is_dst]]]]]]] )

Identical to mktime() except the passed parameters represents a GMT date. gmmktime() internally uses mktime() so only times valid in derived local time can be used.

Like mktime(), arguments may be left out in order from right to left, with any omitted arguments being set to the current corresponding GMT value.

## Parameters

hour

  The hour

minute

  The minute

second

  The second

month

  The month

day

  The day

year

  The year

is_dst

  Parameters always represent a GMT date so is_dst doesn't influence the result.

## Return Values

Returns a integer Unix timestamp.

## ChangeLog

Version | Description
--- | ---
5.1.0 | As of PHP 5.1.0, the is_dst parameter became deprecated. As a result, the new timezone handling features should be used instead.

## �d��

範例 1. gmmktime() on Windows boundary
`<?php gmmktime(0, 0, 0, 1, 1, 1970); // valid in GMT and west, invalid in east ?>`

## �Ѧ�

mktime()
date()
time()

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