maybe I am wrong, but I think
SUNFUNCS_RET_TIMESTAMP return GMT(0) time
SUNFUNCS_RET_STRING Return local time
SUNFUNCS_RET_DOUBLE Return local time
date_sunrise
(PHP 5, PHP 7, PHP 8)
date_sunrise — Returns time of sunrise for a given day and location
Warning
This function has been DEPRECATED as of PHP 8.1.0. Relying on this function is highly discouraged. Use date_sun_info() instead.
Description
date_sunrise(
int
int
?float
?float
?float
?float
): string|int|float|false
int
$timestamp,int
$returnFormat = SUNFUNCS_RET_STRING,?float
$latitude = null,?float
$longitude = null,?float
$zenith = null,?float
$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
timestampof the day from which the sunrise time is taken. -
returnFormat -
returnFormatconstantsconstant 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 -
zenithis the angle between the center of the sun and a line perpendicular to earth's surface. It defaults to date.sunrise_zenithCommon zenithanglesAngle 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
utcOffsetis ignored, ifreturnFormatisSUNFUNCS_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.
Errors/Exceptions
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.
|
Examples
Example #1 date_sunrise() example
<?php
/* calculate the sunrise time for Lisbon, Portugal
Latitude: 38.4 North
Longitude: 9 West
Zenith ~= 90
offset: +1 GMT
*/
echo date("D M d Y"). ', sunrise time : ' .date_sunrise(time(), SUNFUNCS_RET_STRING, 38.4, -9, 90, 1);
?>The above example will output something similar to:
Mon Dec 20 2004, sunrise time : 08:54
Example #2 No sunrise
<?php
$solstice = strtotime('2017-12-21');
var_dump(date_sunrise($solstice, SUNFUNCS_RET_STRING, 69.245833, -53.537222));
?>The above example will output:
bool(false)
See Also
- date_sun_info() - Returns an array with information about sunset/sunrise and twilight begin/end
add a note
User Contributed Notes 3 notes
nomail at nospam dot com ¶
6 years ago
scottix at gmail dot com ¶
11 years ago
If you are working in multiple timezones getting the offset from a date is a little tricky because you need it in hours.
<?php
$time = new DateTime('now', new DateTimeZone('America/Los_Angeles'));
date_sunrise(
$time->getTimestamp(),
SUNFUNCS_RET_TIMESTAMP,
38.4,
-9,
90,
$time->getOffset() / 3600
);
jonathanNO dot kuhnSPAM at gmailNOSPAM dot com ¶
14 years ago
After some searching, I finally found a website that can calculate the sun's zenith. Just look up your city's lat/long (remember, west/south are negative even if it doesn't show where you look up the lat/long) and the time of sunrise/sunset and use this site:
http://solardat.uoregon.edu/cgi-bin/SolarPositionCalculator.cgi
You have to enter in the sunrise/sunset times separately, but it works.
San Diego is:
Lat: 32.73
Long: -117.17
Sunrise Z.: 90.7379
Sunset Z.: 90.8880
