date_sunrise
int$timestamp,
[int$returnFormat = SUNFUNCS_RET_STRING],
[float|null$latitude = null],
[float|null$longitude = null],
[float|null$zenith = null],
[float|null$utcOffset = null]
): string|int|float|false
date_sunrise returns the sunrise time for a given day (specified as a timestamp) and location.
Parameters
- timestamp
-
The timestamp of the day from which the sunrise time is taken.
- returnFormat
-
returnFormat 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 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.sunrise_zenith
Common zenith angles
Angle Description 90°50' Sunrise: the point where the sun becomes visible. 96° Civil twilight: conventionally used to signify the start of dawn. 102° Nautical twilight: the point at which the horizon starts being visible at sea. 108° Astronomical twilight: the point at which the sun starts being the source of any illumination. - utcOffset
-
Specified in hours. The utcOffset is ignored, if returnFormat is SUNFUNCS_RET_TIMESTAMP.
Return Values
Returns the sunrise time in a specified returnFormat on success or false on failure. One potential reason for failure is that the sun does not rise at all, which happens inside the polar circles for part of the year.
Exceptions and Errors
Every call to a date/time function will generate a E_WARNING if the time zone is not valid. See also date_default_timezone_set
Changelog
| Version | Description |
| 8.1.0 | This function has been deprecated in favor of date_sun_info. |
| 8.0.0 | latitude, longitude, zenith and utcOffset are nullable now. |