date_sunrise
(PHP 5)
date_sunrise — Returns time of sunrise for a given day and location
Description
$timestamp
[, int $format
= SUNFUNCS_RET_STRING
[, float $latitude
= ini_get("date.default_latitude")
[, float $longitude
= ini_get("date.default_longitude")
[, float $zenith
= ini_get("date.sunrise_zenith")
[, float $gmt_offset
= 0
]]]]] )
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. -
format
-
format
constantsconstant 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
-
Default: date.sunrise_zenith
-
gmtoffset
-
Specified in hours.
Return Values
Returns the sunrise time in a specified format
on
success or FALSE
on failure.
Errors/Exceptions
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()
Changelog
Version | Description |
---|---|
5.1.0 |
Now issues the |
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
- PHP Руководство
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- Дата и Время
- checkdate
- date_add
- date_create_from_format
- date_create_immutable_from_format
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- date_create
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- date_default_timezone_set
- date_diff
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- date_interval_create_from_date_string
- date_interval_format
- date_isodate_set
- date_modify
- date_offset_get
- date_parse_from_format
- date_parse
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- date_sun_info
- date_sunrise
- date_sunset
- date_time_set
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- timezone_abbreviations_list
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- timezone_location_get
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- timezone_open
- timezone_transitions_get
- timezone_version_get
Коментарии
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
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
);
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