DATE_SUNSET
Returns time of sunset for a given day and location
SYNTAX
date_sunset ( int $timestamp [, int $returnFormat = 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 $utcOffset = 0 ]]]]] ) : mixed
PARAMETERS
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 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
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.
RETURN
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.
EXAMPLES
TIMESTAMP
14:57
RETURNFORMAT | SUNFUNCS_RET_STRING
14:57
RETURNFORMAT | SUNFUNCS_RET_DOUBLE
14.95249708236
RETURNFORMAT | SUNFUNCS_RET_TIMESTAMP
1603551428
LATITUDE
14:40
LONGITUDE
00:21
ZENITH
00:21
UTCOFFSET
01:21
NO SUNSET
false