gmdate

(PHP 4, PHP 5, PHP 7)

gmdate — 格式化一个 GMT/UTC 日期／时间

说明

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

同 date() 函数完全一样，只除了返回的时间是格林威治标准时（GMT）。例如当在中国（GMT +0800）运行以下程序时，第一行显示"Jan 01 2000 00:00:00"而第二行显示"Dec 31 1999 16:00:00"。

Example #1 gmdate() 例子


<?php
echo date("M d Y H:i:s", mktime (0,0,0,1,1,2000));
echo gmdate("M d Y H:i:s", mktime (0,0,0,1,1,2000));
?>

Note:
在 PHP 5.1.0 之前，负的时间戳（1970 年之前的日期）在某些系统下（例如 Windows）不能工作。

参见 date()，mktime()，gmmktime() 和 strftime()。

User Contributed Notes

genna87 at gmail dot com 31-Aug-2016 08:09


A function to get the ISO 8601 timestamp in UTC with precision up to microseconds



function iso_8601_utc_time($precision = 0)

{

    $time = gettimeofday();



    if (is_int($precision) && $precision >= 0 && $precision <= 6) {

        $total = (string) $time['sec'] . '.' . str_pad((string) $time['usec'], 6, '0', STR_PAD_LEFT);

        $total_rounded = bcadd($total, '0.' . str_repeat('0', $precision) . '5', $precision);

        @list($integer, $fraction) = explode('.', $total_rounded);

        $format = $precision == 0

            ? "Y-m-d\TH:i:s\Z"

            : "Y-m-d\TH:i:s,".$fraction."\Z";

        return gmdate($format, $integer);

    }



    return false;

}

QED2000 07-Aug-2008 08:14


Here is a very simple UTC timestamp:



<?php



 print gmdate("Y-m-d\TH:i:s\Z"); 



?>

jhechtf at gmail dot com 25-Jul-2007 05:19


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.

Blazeme 15-Jun-2007 12:25


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!

ttech5593 at gmail dot com 28-Mar-2006 11:53


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.

gefiltefishee at comcast dot net 11-Mar-2006 10:54


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!

fernandobassani at gmail dot com 28-Dec-2005 02:35


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);

?>

Sir Derek G 25-Nov-2005 08:00


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;


}


?>

rob at geek dot co dot nz 07-Nov-2005 09:06


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.

paul at sysnyx dot com 23-Sep-2005 10:16


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().

ncofreNOSPAMPLEASE at step2u dot com 20-May-2005 01:21


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"];





?>

Kogik inc dot -- info at kogik dot com 08-Jul-2004 11:35


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.

www.l-serwis.wpt.pl 13-Nov-2003 10:51


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);


?>

08-Sep-2002 06:26


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");


?>

15-Jun-2002 05:09


For an RFC 1123 (HTTP header date) date, try:





<?php


$rfc_1123_date = gmdate('D, d M Y H:i:s T', time());


?>