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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.

Table 1. format constants

constantdescriptionexample
SUNFUNCS_RET_STRINGreturns the result as string16:46
SUNFUNCS_RET_DOUBLEreturns the result as float16.78243132
SUNFUNCS_RET_TIMESTAMPreturns the result as integer (timestamp)1095034606

Example 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);

?>

The above example will output something similar to:

Mon Dec 20 2004, sunset time : 18:13

See also date_sunrise().

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