In the last example, conversion from seconds to Hour, Minutes, Seconds is wrong.
This is the correct verion:
<?php
$si = date_sun_info(strtotime('2022-08-26'), 50.45, 30.52);
$diff = $si['sunset'] - $si['sunrise']; # $diff is measured in seconds.
echo "Length of day: ",
floor($diff / 3600), "h",
floor(($diff % 3600) / 60), "m",
floor($diff % 60), "s\n";
?>
Output:
Length of day: 13h53m15s
date_sun_info
(PHP 5 >= 5.1.2, PHP 7, PHP 8)
date_sun_info — Returns an array with information about sunset/sunrise and twilight begin/end
Parameters
-
timestamp -
Unix timestamp.
-
latitude -
Latitude in degrees.
-
longitude -
Longitude in degrees.
Return Values
Returns array on success or false on failure.
The structure of the array is detailed in the following list:
-
sunrise - The timestamp of the sunrise (zenith angle = 90°35').
-
sunset - The timestamp of the sunset (zenith angle = 90°35').
-
transit - The timestamp when the sun is at its zenith, i.e. has reached its topmost point.
-
civil_twilight_begin -
The start of the civil dawn (zenith angle = 96°). It ends at
sunrise. -
civil_twilight_end -
The end of the civil dusk (zenith angle = 96°). It starts at
sunset. -
nautical_twilight_begin -
The start of the nautical dawn (zenith angle = 102°). It ends at
civil_twilight_begin. -
nautical_twilight_end -
The end of the nautical dusk (zenith angle = 102°). It starts at
civil_twilight_end. -
astronomical_twilight_begin -
The start of the astronomical dawn (zenith angle = 108°). It ends at
nautical_twilight_begin. -
astronomical_twilight_end -
The end of the astronomical dusk (zenith angle = 108°). It starts at
nautical_twilight_end.
The values of the array elements are either UNIX timestamps, false if the
sun is below the respective zenith for the whole day, or true if the sun is
above the respective zenith for the whole day.
Changelog
| Version | Description |
|---|---|
| 7.2.0 | The calculation was fixed with regards to local midnight instead of local noon, which changes the results slightly. |
Examples
Example #1 A date_sun_info() example
<?php
$sun_info = date_sun_info(strtotime("2006-12-12"), 31.7667, 35.2333);
foreach ($sun_info as $key => $val) {
echo "$key: " . date("H:i:s", $val) . "\n";
}
?>The above example will output:
sunrise: 05:52:11 sunset: 15:41:21 transit: 10:46:46 civil_twilight_begin: 05:24:08 civil_twilight_end: 16:09:24 nautical_twilight_begin: 04:52:25 nautical_twilight_end: 16:41:06 astronomical_twilight_begin: 04:21:32 astronomical_twilight_end: 17:12:00
Example #2 Polar night, with some processing
<?php
$tz = new \DateTimeZone('America/Anchorage');
$si = date_sun_info(strtotime("2022-12-21"), 70.21, -148.51);
foreach ($si as $key => $value) {
echo
match ($value) {
true => 'always',
false => 'never',
default => date_create("@{$value}")->setTimeZone($tz)->format( 'H:i:s T' ),
},
": {$key}",
"\n";
}
?>The above example will output:
never: sunrise never: sunset 12:52:18 AKST: transit 10:53:19 AKST: civil_twilight_begin 14:51:17 AKST: civil_twilight_end 09:01:47 AKST: nautical_twilight_begin 16:42:48 AKST: nautical_twilight_end 07:40:47 AKST: astronomical_twilight_begin 18:03:49 AKST: astronomical_twilight_end
Example #3 Midnight sun (Tromsø, Norway)
<?php
$si = date_sun_info(strtotime("2022-06-26"), 69.68, 18.94);
print_r($si);
?>The above example will output:
Array
(
[sunrise] => 1
[sunset] => 1
[transit] => 1656240426
[civil_twilight_begin] => 1
[civil_twilight_end] => 1
[nautical_twilight_begin] => 1
[nautical_twilight_end] => 1
[astronomical_twilight_begin] => 1
[astronomical_twilight_end] => 1
)
Example #4 Calculating length of day (Kyiv)
<?php
$si = date_sun_info(strtotime('2022-08-26'), 50.45, 30.52);
$diff = $si['sunset'] - $si['sunrise'];
echo "Length of day: ",
floor($diff / 3600), "h ",
floor(($diff % 3600) / 60), "s\n";
?>The above example will output:
Length of day: 13h 56s
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User Contributed Notes 1 note
TheFax ¶
2 years ago
