&reftitle.runtime; &extension.runtime;

# Date/Time Configuration Options

&Name; | &Default; | &Changeable; | &Changelog;
date.default_latitude | "31.7667" | `INI_ALL` |
date.default_longitude | "35.2333" | `INI_ALL` |
date.sunrise_zenith | "90.833333" | `INI_ALL` | Prior to PHP 8.0.0, the default was "90.583333"
date.sunset_zenith | "90.833333" | `INI_ALL` | Prior to PHP 8.0.0, the default was "90.583333"
date.timezone | "UTC" | `INI_ALL` | From PHP 8.2, a warning is emitted when setting this to an invalid value or an empty string.

&ini.php.constants; &ini.descriptions.title;

`date.default_latitude` `float`

- The default latitude ranging from `0` at the equator, to `+90` northward, and `-90` southward.

`date.default_longitude` `float`

- The default longitude ranging from `0` at the prime meridian to `+180` eastward and `−180` westward.

`date.sunrise_zenith` `float`

- The default sunrise zenith.

  The default value is 90°50'. The additional 50' is due to two components: the Sun's radius, which is 16', and the atmospheric refraction, which is 34'.

`date.sunset_zenith` `float`

- The default sunset zenith.

`date.timezone` `string`

- The default timezone used by all date/time functions. The precedence order for which timezone is used if none is explicitly mentioned is described in the `date_default_timezone_get` page. See timezones for a list of supported timezones.

The first four configuration options are currently only used by `date_sunrise` and `date_sunset`.