The difference between php function date and gmdate

The difference between php function date and gmdate_PHP tutorial

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Release： 2016-07-20 11:03:23

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PHP has two time formatting functions: date() and gmdate(). The description in the official documentation is date - formats a local time/date gmdate - formats a GMT/UTC date/time, and returns Green U.K. Standard Time (GMT).

For example, our current time zone is +8, then the time returned by the server running the following script should be like this:

The current time is assumed to be 2007-03-14 12:15:27

The code is as follows

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代码如下

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echo date(‘Y-m-d H:i:s’, time()); 输出为：2007-03-14 12:15:27

echo gmdate(‘Y-m-d H:i:s’, time()); 输出为：2007-03-14 04:15:27

echo date(‘Y-m-d H:i:s’, time()); The output is: 2007-03-14 12:15:27

echo gmdate(‘Y-m-d H:i:s’, time()); The output is: 2007-03-14 04:15:27

But this is only the result of running PHP under Linux+Apache. If it is run under Windows, both functions return: 2007-03-14 04:15:27.

PHP Date/Time constants

PHP: Indicates the earliest PHP version that supports this constant.

Constant Description PHP

DATE_ATOM atomic clock format (eg: 2005-08-15T16:13:03+0000)
DATE_COOKIE HTTP Cookies format (eg: Sun, 14 Aug 2005 16:13:03 UTC)
DATE_ISO8601 ISO-8601 (eg: 2005-08-14T16:13:03+0000)
DATE_RFC822 RFC 822 (eg: Sun, 14 Aug 2005 16:13:03 UTC)
DATE_RFC850 RFC 850 (eg: Sunday, 14-Aug-05 16:13:03 UTC)
DATE_RFC1036 RFC 1036 (eg: Sunday, 14-Aug-05 16:13:03 UTC)
DATE_RFC1123 RFC 1123 (eg: Sun, 14 Aug 2005 16:13:03 UTC)

DATE_RFC2822 RFC 2822 (eg: Sun, 14 Aug 2005 16:13:03 +0000)

DATE_RSS RSS (eg: Sun, 14 Aug 2005 16:13:03 UTC)
DATE_W3C World Wide Web Consortium (eg: 2005-08-14T16:13:03+0000)

Therefore, we should give a compatible writing method, use gmdate uniformly, and set the current time zone manually. The writing method is improved as follows:

echo gmdate(‘Y-m-d H:i:s’, time() + 3600 * 8);

gmdate(): Returns the "custom format" time of the current GMT standard time, which has nothing to do with the time zone set by the PHP system.

Example 1

代码如下

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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));
?>

输出：

Jan 01 2000 00:00:00
Dec 31 1999 16:00:00

When running the following program in China (GMT +0800), the first line displays "Jan 01 2000 00:00:00" while the second line displays "Dec 31 1999 16:00:00".

The code is as follows	Copy code
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)); ?> Output: Jan 01 2000 00:00:00 Dec 31 1999 16:00:00

例子 2

代码如下

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代码如下

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echo("Result with gmdate():
");
echo(gmdate("l") . "
");
echo(gmdate("l dS of F Y h:i:s A") . "
");
echo("Oct 3,1975 was on a ".gmdate("l", mktime(0,0,0,10,3,1975))."
");
echo(gmdate(DATE_RFC822) . "
");
echo(gmdate(DATE_ATOM,mktime(0,0,0,10,3,1975)) . "
");
?>

输出：

Result with date():
Tuesday
Tuesday 24th of January 2006 02:41:22 PM
Oct 3,1975 was on a Friday
Tue, 24 Jan 2006 14:41:22 CET
1975-10-03T00:00:00+0100

Result with gmdate():
Tuesday
Tuesday 24th of January 2006 01:41:22 PM
Oct 3,1975 was on a Thursday
Tue, 24 Jan 2006 13:41:22 GMT
1975-10-02T23:00:00+0000

echo("Result with date():
");
echo(date("l") . "
");
echo(date("l dS of F Y h:i:s A") . "
");
echo("Oct 3,1975 was on a ".date("l", mktime(0,0,0,10,3,1975))."
");
echo(date(DATE_RFC822) . "
");
echo(date(DATE_ATOM,mktime(0,0,0,10,3,1975)) . "

");
echo("Result with gmdate():
");
echo(gmdate("l") . "
");
echo(gmdate("l dS of F Y h:i:s A") . "
");
echo("Oct 3,1975 was on a ".gmdate("l", mktime(0,0,0,10,3,1975))."
");
echo(gmdate(DATE_RFC822) . "
");
echo(gmdate(DATE_ATOM,mktime(0,0,0,10,3,1975)) . "
");
?>