PHP 5, PHP 7, PHP 8
date_sunset - Returns time of sunset for a given day and location
Code Examples

     [int$returnFormat = SUNFUNCS_RET_STRING],
     [float|null$latitude = null],
     [float|null$longitude = null],
     [float|null$zenith = null],
     [float|null$utcOffset = null]
): string|int|float|false

date_sunset returns the sunset time for a given day (specified as a timestamp) and location.



The timestamp of the day from which the sunset time is taken.


returnFormat constants
constant description example
SUNFUNCS_RET_STRING returns the result as string 16:46
SUNFUNCS_RET_DOUBLE returns the result as float 16.78243132
SUNFUNCS_RET_TIMESTAMP returns the result as int (timestamp) 1095034606


Defaults to North, pass in a negative value for South. See also: date.default_latitude


Defaults to East, pass in a negative value for West. See also: date.default_longitude


zenith is the angle between the center of the sun and a line perpendicular to earth's surface. It defaults to date.sunset_zenith

Common zenith angles
Angle Description
90°50' Sunset: the point where the sun becomes invisible.
96° Civil twilight: conventionally used to signify the end of dusk.
102° Nautical twilight: the point at which the horizon ends being visible at sea.
108° Astronomical twilight: the point at which the sun ends being the source of any illumination.


Specified in hours. The utcOffset is ignored, if returnFormat is SUNFUNCS_RET_TIMESTAMP.

Return Values

Returns the sunset time in a specified returnFormat on success or false on failure. One potential reason for failure is that the sun does not set at all, which happens inside the polar circles for part of the year.

Exceptions and Errors

Every call to a date/time function will generate a E_WARNING if the time zone is not valid. See also date_default_timezone_set


Version Description
8.1.0 This function has been deprecated in favor of date_sun_info.
8.0.0 latitude, longitude, zenith and utcOffset are nullable now.

Related Functions

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Function date_sunset:

Date and Time Functions

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