PHP Date / Time Functions

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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:

NameDefaultDescriptionChangeable
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.

FunctionDescriptionPHP
checkdate()Validates a Gregorian date3
date_default_timezone_get()Returns the default time zone5
date_default_timezone_set()Sets the default time zone5
date_sunrise()Returns the time of sunrise for a given day / location5
date_sunset()Returns the time of sunset for a given day / location5
date()Formats a local time/date3
getdate()Returns an array that contains date and time information for a Unix timestamp3
gettimeofday()Returns an array that contains current time information3
gmdate()Formats a GMT/UTC date/time3
gmmktime()Returns the Unix timestamp for a GMT date3
gmstrftime()Formats a GMT/UTC time/date according to locale settings3
idate()Formats a local time/date as integer5
localtime()Returns an array that contains the time components of a Unix timestamp4
microtime()Returns the microseconds for the current time3
mktime()Returns the Unix timestamp for a date3
strftime()Formats a local time/date according to locale settings3
strptime()Parses a time/date generated with strftime()5
strtotime()Parses an English textual date or time into a Unix timestamp3
time()Returns the current time as a Unix timestamp3

 


PHP Date / Time Constants

PHP: indicates the earliest version of PHP that supports the constant.

ConstantDescriptionPHP
DATE_ATOMAtom (example: 2005-08-15T16:13:03+0000)
DATE_COOKIEHTTP Cookies (example: Sun, 14 Aug 2005 16:13:03 UTC)
DATE_ISO8601ISO-8601 (example: 2005-08-14T16:13:03+0000)
DATE_RFC822RFC 822 (example: Sun, 14 Aug 2005 16:13:03 UTC)
DATE_RFC850RFC 850 (example: Sunday, 14-Aug-05 16:13:03 UTC)
DATE_RFC1036RFC 1036 (example: Sunday, 14-Aug-05 16:13:03 UTC)
DATE_RFC1123RFC 1123 (example: Sun, 14 Aug 2005 16:13:03 UTC)
DATE_RFC2822RFC 2822 (Sun, 14 Aug 2005 16:13:03 +0000)
DATE_RSSRSS (Sun, 14 Aug 2005 16:13:03 UTC)
DATE_W3CWorld Wide Web Consortium (example: 2005-08-14T16:13:03+0000)
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