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PHP Manual

## Runtime Configuration

The behaviour of these functions is affected by settings in php.ini.

Date/Time Configuration Options
Name | Default | Changeable | Changelog
--- | --- | --- | ---
date.default_latitude | "31.7667" | PHP_INI_ALL | Available since PHP 5.0.0.
date.default_longitude | "35.2333" | PHP_INI_ALL | Available since PHP 5.0.0.
date.sunrise_zenith | "90.583333" | PHP_INI_ALL | Available since PHP 5.0.0.
date.sunset_zenith | "90.583333" | PHP_INI_ALL | Available since PHP 5.0.0.
date.timezone | "" | PHP_INI_ALL | Available since PHP 5.1.0.

For further details and definitions of the PHP_INI_* constants, see the php.ini directives.

Here's a short explanation of the configuration directives.

`date.default_latitude` float

  The default latitude.

`date.default_longitude` float

  The default longitude.

`date.sunrise_zenith` float

  The default sunrise zenith.

`date.sunset_zenith` float

  The default sunset zenith.

`date.timezone` string

  The default timezone used by all date/time functions if the TZ environment variable isn't set. The precedence order is described in the date_default_timezone_get() page. See List of Supported Timezones for a list of supported timezones.

> Note: The first four configuration options are currently only used by date_sunrise() and date_sunset().

Installation
Resource Types
Installing/Configuring
PHP Manual