date_sunset

(PHP 5, PHP 7)

date_sunset — Returns time of sunset for a given day and location

Descrierea

date_sunset() returns the sunset time for a given day (specified as a timestamp) and location.

Parametri

timestamp

The timestamp of the day from which the sunset 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.sunset_zenith

**Common `zenith` angles**
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.

Erori/Excepții

Fiecare apel al unei funcții de dată/oră va genera o E_NOTICE dacă zona orară nu este validă și/sau un mesaj E_STRICT sau E_WARNING dacă se utilizează setările sistemului sau variabila de mediu TZ. Vedeți de asemenea date_default_timezone_set()

Valorile întoarse

Returns the sunset time in a specified returnFormat on success sau false în cazul eșecului. 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.

Istoricul schimbărilor

Versiune	Descriere
8.0.0	`latitude`, `longitude`, `zenith` and `latitude` are nullable now.

Exemple

Example #1 date_sunset() example


<?php

/* calculate the sunset time for Lisbon, Portugal
Latitude: 38.4 North
Longitude: 9 West
Zenith ~= 90
offset: +1 GMT
*/

echo date("D M d Y"). ', sunset time : ' .date_sunset(time(), SUNFUNCS_RET_STRING, 38.4, -9, 90, 1);

?>

Exemplul de mai sus va afișa ceva similar cu:

Mon Dec 20 2004, sunset time : 18:13

Example #2 No sunset


<?php
$solstice = strtotime('2017-12-21');
var_dump(date_sunset($solstice, SUNFUNCS_RET_STRING, 69.245833, -53.537222));
?>

Exemplul de mai sus va afișa:

bool(false)

A se vedea și

date_sunrise() - Returns time of sunrise for a given day and location
date_sun_info() - Returns an array with information about sunset/sunrise and twilight begin/end

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User Contributed Notes 3 notes

down

matt at mctsoft dot net ¶

5 years ago


yes SUNFUNCS_RET_TIMESTAMP does return GMT(0) time

so something like...

$arr = localtime(date_sunset(time(),SUNFUNCS_RET_TIMESTAMP,51.5,0)); // London

$hh = $arr[2];
$mm = $arr[1];

Will give figure out your localtime and daylight saving (BST)

down

-1

nospam at nomail dot com ¶

6 years ago


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

down

-25

michael at dayah dot com ¶

18 years ago


I use an IP to location database to determine the visitor's approximate latitude and longitude and then serve them a day or night color scheme based on whether it is before civil dawn or dusk. I've had problems when not specifying the timezone, specifically a 1 hour error, so I use GMT.



<?php

date_default_timezone_set("GMT");



function scheme() {

        $sunrise = date_sunrise(time(), SUNFUNCS_RET_DOUBLE, $latitude, $longitude, 96, 0);

        $sunset = date_sunset(time(), SUNFUNCS_RET_DOUBLE, $latitude, $longitude, 96, 0);

        $now = date("H") + date("i") / 60 + date("s") / 3600;



        if ($sunrise < $sunset)

                if (($now > $sunrise) && ($now < $sunset)) return "day";

                else return "night";

        else

                if (($now > $sunrise) || ($now < $sunset)) return "day";

                else return "night";

}

?>

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