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HOME > PHP Manual > date_sunset - Returns time of sunset for a given day and location

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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.

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.sunrise_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

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