(PHP 5, PHP 7)
date_sunset — Returns time of sunset for a given day and location
date_sunset ( int $timestamp [, int $returnFormat = SUNFUNCS_RET_STRING [, float|null $latitude = null [, float|null $longitude = null [, float|null $zenith = null [, float|null $utcOffset = 0 ]]]]] ) : string|int|float|false
date_sunset() returns the sunset time for a given day (specified as a timestamp) and location.
timestamp
The timestamp of the day from which the sunset time is taken.
returnFormat
| 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 int (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
zenith is the angle between the center of the sun and a line perpendicular to earth's surface. It defaults to date.sunset_zenith
| Angle | Description |
|---|---|
| 90°50' | Sunset: the point where the sun becomes invisible. |
| 96° | Civil twilight: conventionally used to signify the end of dusk. |
| 102° | Nautical twilight: the point at which the horizon ends being visible at sea. |
| 108° | Astronomical twilight: the point at which the sun ends being the source of any illumination. |
utcOffset
Specified in hours. The utcOffset is ignored, if returnFormat is SUNFUNCS_RET_TIMESTAMP.
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()
Returns the sunset time in a specified returnFormat on success or false on failure. One potential reason for failure is that the sun does not set at all, which happens inside the polar circles for part of the year.
| Version | Description |
|---|---|
| 8.0.0 | latitude, longitude, zenith and latitude are nullable now. |
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
Example #2 No sunset
<?php
$solstice = strtotime('2017-12-21');
var_dump(date_sunset($solstice, SUNFUNCS_RET_STRING, 69.245833, -53.537222));
?> The above example will output:
bool(false)
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https://www.php.net/manual/en/function.date-sunset.php