## 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" | `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.

For further details and definitions of the INI_* modes, see the Where a configuration setting may be set.

Here's a short explanation of the configuration directives.

`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 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().

`↑` and `↓` to navigate • `Enter` to select • `Esc` to close • `/` to open