Returns time of sunset for a given day and location

Description

mixed date_sunset ( int $timestamp [, int $format= SUNFUNCS_RET_STRING [, float $latitude= ini_get("date.default_latitude") [, float $longitude= ini_get("date.default_longitude") [, float $zenith= ini_get("date.sunset_zenith") [, float $gmt_offset= 0 ]]]]] )

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

Parameters

timestamp

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

format

*`format`* 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 integer (timestamp)	1095034606

latitude

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

longitude

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

zenith

Default: date.sunset_zenith

gmtoffset

Specified in hours.

Errors/Exceptions

Every call to a date/time function will generate a E_NOTICE if the time zone is not valid, and/or a E_STRICT message if using the system settings or the TZ environment variable. See also date_default_timezone_set()

Changelog

Version	Description
5.1.0	Now issues the `E_STRICT` and `E_NOTICE` time zone errors.

Return Values

Returns the sunset time in a specified format on success, or FALSE on failure.

Examples

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