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
| 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 |
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().
