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# date_sunset

(PHP 5)

date_sunset -- Returns time of sunset for a given day and location

## Description

mixed date_sunset ( int timestamp [, int format [, float latitude [, float longitude [, float zenith [, float gmt_offset]]]]] )

date_sunset() returns the sunset time for a given day (specified as a timestamp) and location. The latitude, longitude and zenith parameters default to the date.default_latitude, date.default_longitude and date.sunset_zenith configuration options, respectively.

The latitude defaults to North. So, if you want to specify a South value, you must pass a negative value. The same note applies to longitude, which defaults to East.

The gmt_offset parameter is specified in hours.

Tabelle 1. format constants

constant | description | example
--- | --- | ---
SUNFUNCS_RET_STRING | returns the sunset time as string | 16:46
SUNFUNCS_RET_DOUBLE | returns the result as float | 16.78243132
SUNFUNCS_RET_TIMESTAMP | returns the sunset time as an integer (timestamp) | 1095034606

Beispiel 1. date_sunset() example
`<?php /* calculate the sunset time for Lisbon, Portugal Latitude: 38.4 North Longitude: 9 West Zenith ~= 90 offset: +1 GMT */ echo date("D M d Y"). ', sunset time : ' .date_sunset(time(), SUNFUNCS_RET_STRING, 38.4, -9, 90, 1); ?>`
Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:
    Mon Dec 20 2004, sunset time : 18:13

See also date_sunrise().

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