Mid-Atlantic Developer Conference - Call for Speakers


(PHP 5)

date_sunset Returns time of sunset for a given day and location


mixed date_sunset ( int $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.sunset_zenith") [, float $gmt_offset = 0 ]]]]] )

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

Elenco dei parametri


The timestamp of the day from which the sunset time is taken.


format 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 integer (timestamp) 1095034606


Defaults to North, pass in a negative value for South. See also: date.default_latitude


Defaults to East, pass in a negative value for West. See also: date.default_longitude


Default: date.sunset_zenith


Specified in hours.


Ogni chiamata a una funzione data/ora genera un E_NOTICE se il time zone non è valido, e/o un messaggio E_STRICT o E_WARNING se si usano le impostazioni di sistema o la variabile d'ambiente TZ. Vedere anche date_default_timezone_set()

Log delle modifiche

Versione Descrizione

Ora emette gli errori time zone E_STRICT e E_NOTICE

Valori restituiti

Returns the sunset time in a specified format on success o FALSE in caso di fallimento.


Example #1 date_sunset() example


/* 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_STRING38.4, -9901);


Il precedente esempio visualizzerà qualcosa simile a:

Mon Dec 20 2004, sunset time : 18:13

Vedere anche:

  • date_sunrise() - Returns time of sunrise for a given day and location

add a note add a note

User Contributed Notes 1 note

michael at dayah dot com
11 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.


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