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Returns time of sunset for a given day and location


date_sunset

(PHP 5)

date_sunset 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 or E_WARNING 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_STRING38.4, -9901);

?>

The above example will output something similar to:

 Mon Dec 20 2004, sunset time : 18:13 

See Also

  • date_sunrise() - Returns time of sunrise for a given day and location



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