gmdate

(PHP 4, PHP 5)

gmdateFormat a GMT/UTC date/time

Description

string gmdate ( string $format [, int $timestamp = time() ] )

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.

Examples

Example #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(000111998));
echo 
gmdate("M d Y H:i:s"mktime(000111998));
?>

See Also

  • date() - Format a local time/date
  • mktime() - Get Unix timestamp for a date
  • gmmktime() - Get Unix timestamp for a GMT date
  • strftime() - Format a local time/date according to locale settings

add a note add a note

User Contributed Notes 14 notes

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6
ttech5593 at gmail dot com
8 years ago
For me most of the examples here needed the + or - seconds to set the time zone. I wanted a faster way to get the time zone in seconds. So I created this :
<?php
$h
= "3";// Hour for time zone goes here e.g. +7 or -4, just remove the + or -
$hm = $h * 60;
$ms = $hm * 60;
$gmdate = gmdate("m/d/Y g:i:s A", time()-($ms)); // the "-" can be switched to a plus if that's what your time zone is.
echo "Your current time now is :  $gmdate . ";
?>
It works. Hope it helps.
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2
fernandobassani at gmail dot com
8 years ago
If you have the same application running in different countries, you may have some troubles getting the local time..
In my case, I was having troubles with a clock created with Macromedia Flash... the time shown by the clock was supposed to be set up by the server, passing the timestamp. When I moved the file to another country, I got a wrong time...
You can use the timezone offset ( date("Z") ) to handle this kind of thing...

<?php
$timestamp
= time()+date("Z");
echo
gmdate("Y/m/d H:i:s",$timestamp);
?>
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3
QED2000
5 years ago
Here is a very simple UTC timestamp:

<?php

print gmdate("Y-m-d\TH:i:s\Z");

?>
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2
paul at sysnyx dot com
8 years ago
Gives user the ability to use their timezone preferences.
I had to create this script for a very large community. I first made any posts to the database that would display the date using just time();

Example: mysql_query("INSERT INTO `table` (`datetime`) VALUES ('".time()."')");

Also, for their timezone preference, I had the values as (example):
(Eastern Timezone) -5 hours
(Newfoundland) -3 hours -30 minutes

This information would be saved in the users table.
To display the date and time in their respective timezone preference:

<?php
function datetime($datetime,$zone){
if(
date('I')):$datetime+=60*60;endif;
return
gmdate('m-d-Y - h:i:sa',strtotime($zone,$datetime));
}
?>

$datetime would be the information pulled from the database from a post for news, forums, etcetera (remember, the inserted table data for the time was using time();)
$zone would be the information pulled from the database from the users timezone preference.

I also used cookies to store their timezone:
$sth=mysql_query("SELECT `datetime` FROM `table` LIMIT 1");
$row=mysql_fetch_assoc($sth);
echo datetime($row['datetime'],$_COOKIE['timezone']);

Remember to set the 'm-d-Y - h:i:sa' to how you wish the time to display. Visit the manual about date().
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1
Anonymous
11 years ago
Do not use the "T" timezone specifier to generate "GMT", as this may return "UTC" or "GMT+0000" or "Z" or something else which depends on the running platform, which would not be RFC1123 compliant.

Use 'D, d M Y H:i:s \G\M\T' which forces the value of the timezone indicator.

Note that RFC1123 requires the use of ENGLISH day and month abbreviations. They MUST NOT be localized!

An example of the RFC1123 format for full dates is:
Sun, 06 Nov 1994 08:49:37 GMT

Note the presence of the leading 0 (RFC1123 dates have a fixed size, and space padding is prohibited because it causes problems with fixed size handling when such dates are used in HTTP headers that may compress whitespaces.

Some proxies accept also the ISO 8601 format, but this is not documented in HTTP/1.1 specs (RFC2616).

Examples:
<?php
header
('Date: '.gmdate('D, d M Y H:i:s \G\M\T', time()));
header('Last-Modified: '.gmdate('D, d M Y H:i:s \G\M\T', time()));
header('Expires: '.gmdate('D, d M Y H:i:s \G\M\T', time() + 3600));
?>

or if you prefer double quotes and don't want to bother with double backslashes:
<?php
header
("Date: ".gmdate("D, d M Y H:i:s", time())." GMT");
header("Last-Modified: ".gmdate("D, d M Y H:i:s", time())." GMT");;
header("Expires: ".gmdate("D, d M Y H:i:s", time() + 3600)." GMT");
?>
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1
Anonymous
12 years ago
For an RFC 1123 (HTTP header date) date, try:

<?php
$rfc_1123_date
= gmdate('D, d M Y H:i:s T', time());
?>
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0
jhechtf at gmail dot com
6 years ago
My function for something like this is like so:
<?php
function actual_time($format,$offset,$timestamp){
  
//Offset is in hours from gmt, including a - sign if applicable.
   //So lets turn offset into seconds
  
$offset = $offset*60*60;
  
$timestamp = $timestamp + $offset;
   
//Remember, adding a negative is still subtraction ;)
  
return gmdate($format,$timestamp);
}
?>
It's always worked fine for me.
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0
Blazeme
7 years ago
Here, I wrote a function (from code above) for easy time zone
settings.
Regards.
<?php
function datum($datum=true) {
$sign = "+"; // Whichever direction from GMT to your timezone. + or -
$h = "1"; // offset for time (hours)
$dst = true; // true - use dst ; false - don't

if ($dst==true) {
   
$daylight_saving = date('I');
    if (
$daylight_saving){
        if (
$sign == "-"){ $h=$h-1;  }
        else {
$h=$h+1; }
    }
}
$hm = $h * 60;
$ms = $hm * 60;
if (
$sign == "-"){ $timestamp = time()-($ms); }
else {
$timestamp = time()+($ms); }
$gmdate = gmdate("m.d.Y. g:i A", $timestamp);
if(
$datum==true) {
return
$gmdate;
}
else {
return
$timestamp;
}

}
?>

If you set first argument to true, it'll return formated date.
If false, will return $timestamp.
Enjoy!
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0
Kogik inc dot -- info at kogik dot com
10 years ago
Wath out for summer time and winter time...

If you want to get the current date and time based on GMT you could use this :

<?php
$timezone 
= -5; //(GMT -5:00) EST (U.S. & Canada)
echo gmdate("Y/m/j H:i:s", time() + 3600*($timezone+date("I")));
?>

this would gives: 2004/07/8 14:35:19 in summer time
and 2004/07/8 13:35:19 in winter time.

Note that date("I") returns 1 in summer and 0 in winter.
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-1
rob at geek dot co dot nz
8 years ago
It's worth noting the distinction between gmgate() and date() with regards to day light savings time. If your server uses universal time and makes an adjustment by locale for daylight savings time, you will want to use date(). gmdate will display the non-adjuisted time.
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-1
ncofreNOSPAMPLEASE at step2u dot com
9 years ago
Want to put different International Times in your web?

First create a database including the GMT and the DST (find it f.i. at timeanddate.com). Be careful, because there are several different DST dates and options.

Once you have your function which calculates the GMT hour difference (it can be a decimal!!), sum it to the Unix Time (remember that unix time is GMT, not local: f.i. gmdate("U")===date("U)).

Don't forget to recalculate the GMT difference to seconds before it.

Then format your date using gmdate() (not date()!) and... you've got your International Time!

<?php

$city
["Name"] = "Barcelona";
$city["GMT"] = 1.0;
$city["actualDST"] = 1.0; //Because it's summer time

$gmt_diff = $city["GMT"]+$city["actualDST"]; //your functions for getting the hour difference betweer the city and the GMT
$city_time = time()+($gmt_diff*3600); //sum the timestamps
echo gmdate("H:i",$city_time); //echo the formatted date
echo " h. in the beautiful city of ".$city["Name"];

?>
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-2
Sir Derek G
8 years ago
Here's a nifty little function that returns a random timestamp between two dates.

<?php
//////////////////////////////////////////////////////////
// Return a random timestamp between two dates (inclusive)
// Example: Tue, 08 Nov 2004 06:47:10 GMT
//
// time - Starting time string
// Valid Examples:
// 10 September 2001
// next Thursday
// last Monday
// now
//
// time2 - Ending time string
function randomTimestamp($time = "" , $time2 = "")
{
    if(!
$time) $time = strtotime("10 September 2000");
    if(!
$time2) $time2 = strtotime("24 November 2005");
   
$timestamp = date(" D, d M Y", rand( settype($time , int) , settype($time2 , int) )); //Must be called once before becoming random, ???
   
$timestamp = date(" D, d M Y", rand($time , $time2))." ";//Now it's random
   
   
$h = rand(1,23);
    if(
strlen($h) == 1 ) $h = "0$h";
   
$t = $h.":";
   
   
$d = rand(1,29);
    if(
strlen($d) == 1 ) $d = "0$d";
   
$t .= $d.":";
   
   
$s = rand(0,59);
    if(
strlen($s) == 1 ) $s = "0$s";
   
$t .= $s;
   
   
$timestamp .= $t." GMT";
    return
$timestamp;
}
?>
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-1
gefiltefishee at comcast dot net
8 years ago
I was struggling with how to get my browser to output MY local time using gmdate().

I figured it out and here's what you do (ASSUMING THE SERVER IS ON GMT, If not, just echo a generic gmdate() without timezone setting and calculate the number of hours ahead or behind you are of that time, convert it to seconds and add [for ahead] or subtract [for behind] that value to time() ):

NOTE: these are US times [setlocale(LC_TIME, 'en_US')]

for Central Time (7 hours behind GMT):
gmdate("format", time()-(25200));

For Pacific Time (9 hours behind GMT):
gmdate("format", time()-(32400));

REMEMBER - THE VALUES ABOVE ASSUME THE SERVER IS ON GMT

I used the following gmdate() format:
"l, F jS, Y  g:i a"
but you can use what you like ;)

Hope this helps!
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-3
www.l-serwis.wpt.pl
10 years ago
If you want to get time in your timezone try this:

<?php
$zone
=3600*0 //GMT
$zone=3600*1 //CET
$zone=3600*-5//USA
$date=gmdate("D M Y H:i", time() + $zone);
?>
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