PHP Date / Time Functions
PHP Date / Time Introduction
The date/time functions allow you to extract and format the date and time on
the server.
Note: These functions depend on the
locale settings of the server!
Installation
The date/time functions are part of the PHP core. There is no installation
needed to use these functions.
Runtime Configuration
The behavior of the date/time functions is affected by settings in php.ini.
Date/Time configuration options:
| Name |
Default |
Description |
Changeable |
| date.default_latitude |
"31.7667" |
Specifies the default latitude (available since PHP 5).
This option is used by date_sunrise() and date_sunset() |
PHP_INI_ALL |
| date.default_longitude |
"35.2333" |
Specifies the default longitude (available since PHP 5).
This option is used by date_sunrise() and date_sunset() |
PHP_INI_ALL |
| date.sunrise_zenith |
"90.83" |
Specifies the default sunrise zenith (available since PHP
5). This option is used by date_sunrise() and date_sunset() |
PHP_INI_ALL |
| date.sunset_zenith |
"90.83" |
Specifies the default sunset zenith (available since PHP
5). This option is used by date_sunrise() and date_sunset() |
PHP_INI_ALL |
| date.timezone |
"" |
Specifies the default timezone (available since PHP 5.1) |
PHP_INI_ALL |
PHP Date / Time Functions
PHP: indicates the earliest version of PHP that supports the
function.
| Function |
Description |
PHP |
| checkdate() |
Validates a Gregorian date |
3 |
| date_default_timezone_get() |
Returns the default time zone |
5 |
| date_default_timezone_set() |
Sets the default time zone |
5 |
| date_sunrise() |
Returns the time of sunrise for a given day / location |
5 |
| date_sunset() |
Returns the time of sunset for a given day / location |
5 |
| date() |
Formats a local time/date |
3 |
| getdate() |
Returns an array that contains date and time information
for a Unix timestamp |
3 |
| gettimeofday() |
Returns an array that contains current time information |
3 |
| gmdate() |
Formats a GMT/UTC date/time |
3 |
| gmmktime() |
Returns the Unix timestamp for a GMT date |
3 |
| gmstrftime() |
Formats a GMT/UTC time/date according to locale settings |
3 |
| idate() |
Formats a local time/date as integer |
5 |
| localtime() |
Returns an array that contains the time components of a
Unix timestamp |
4 |
| microtime() |
Returns the microseconds for the current time |
3 |
| mktime() |
Returns the Unix timestamp for a date |
3 |
| strftime() |
Formats a local time/date according to locale settings |
3 |
| strptime() |
Parses a time/date generated with strftime() |
5 |
| strtotime() |
Parses an English textual date or time into a Unix
timestamp |
3 |
| time() |
Returns the current time as a Unix timestamp |
3 |
PHP Date / Time Constants
PHP: indicates the earliest version of PHP that supports the
constant.
| Constant |
Description |
PHP |
| DATE_ATOM |
Atom (example: 2005-08-15T16:13:03+0000) |
|
| DATE_COOKIE |
HTTP Cookies (example: Sun, 14 Aug 2005 16:13:03 UTC) |
|
| DATE_ISO8601 |
ISO-8601 (example: 2005-08-14T16:13:03+0000) |
|
| DATE_RFC822 |
RFC 822 (example: Sun, 14 Aug 2005 16:13:03 UTC) |
|
| DATE_RFC850 |
RFC 850 (example: Sunday, 14-Aug-05 16:13:03 UTC) |
|
| DATE_RFC1036 |
RFC 1036 (example: Sunday, 14-Aug-05 16:13:03 UTC) |
|
| DATE_RFC1123 |
RFC 1123 (example: Sun, 14 Aug 2005 16:13:03 UTC) |
|
| DATE_RFC2822 |
RFC 2822 (Sun, 14 Aug 2005 16:13:03 +0000) |
|
| DATE_RSS |
RSS (Sun, 14 Aug 2005 16:13:03 UTC) |
|
| DATE_W3C |
World Wide Web Consortium (example:
2005-08-14T16:13:03+0000) |
|
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