PHP : date_sunset() function


The date_sunset() function returns the time of sunset for a given day and location.


(PHP 4 and above)


date_sunset(timestamp, format, latitude, longitude, zenith, gmt_offset) 


Name Description Required /
timestamp The timestamp of the day. Required Integer
format Sets the format of the output.

Use SUNFUNCS_RET_STRING if you want the output as string (example 16:46)

Use UNFUNCS_RET_DOUBLE if you want the output as float (example 16.78243132)

Use SUNFUNCS_RET_TIMESTAMP if you want the output as integer (example 1095034606)
Optional Integer
latitude Indicates the latitude of a location. Use a negative value for South. The default is North. Optional Float
longitude Indicates the longitude of a location. Use a negative value for West. The default is East. Optional Float
zenith Solar zenith angle. Optional Float
gmt_offset Difference between GMT and local time in hours. For example, since the difference between GMT and Calcutta-India is five and half hours, therefore for IST, use 5.50. Optional Float

Return value:

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

Value Type: Mixed*.

*Mixed : Mixed indicates multiple (but not necessarily all) types.

Example :

//Calculate the sunrise time for Kolkata, India
//Latitude: 22.34 North
//Longitude: 88.24 East
//Zenith ~= 45.6177°
//offset: +5.50 GMT
echo("Date: " . date("D M d Y") . "<br />");
echo("Sunset time: ");

View the example in the browser

See also

PHP Function Reference

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PHP: Anonymous recursive PHP functions

In order for it to work, you need to pass $factorial as a reference

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    if( $n == 1 ) return 1;
    return $factorial( $n - 1 ) * $n;
print $factorial( 5 );

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