how to calculate sunrise and sunset time in php

by THavamani 2014-04-04 12:38:59

how to calculate sunrise and sunset time in php?

There is a default function in php to calculate sunrise and sunset time.

Sunrise and sunset time is given below

date_sunrise(date, SUNFUNCS_RET_STRING, latitude, longitude, zenith, tzoneoffset);
date_sunset(date, SUNFUNCS_RET_STRING, latitude, longitude, zenith, tzoneoffset);


Example:

// Set the timezone for your location, because some servers are in different timezone than your location

$myTZ = 'Asia/Kolkata';

// Set the latitude and longitude for your location
$latitude =22.569722; //North
$longitude =88.369722; //West

$zenith = 90+(50/60); // True sunrise/sunset

// Set timezone in PHP5/PHP4 manner
if (!function_exists('date_default_timezone_set')) {
putenv("TZ=" . $myTZ);
} else {
date_default_timezone_set("$myTZ");
}


// find time offset in hours
$tzoffset = date("Z")/60 / 60;

// determine sunrise time
$sunrise_time= date_sunrise(strtotime("12-10-2014"), SUNFUNCS_RET_STRING, $latitude, $longitude, $zenith, $tzoffset);
echo "Sunrise time=".$sunrise_time;


// determine sunset time
$sunset_time = date_sunset((strtotime("12-10-2014"), SUNFUNCS_RET_STRING, $latitude, $longitude, $zenith, $tzoffset);

echo "Sunset time=".$sunset_time;

Output

Sunrise time=05:35
Sunset time=17:06


This is the way to calculate sunrise and sunset time in php
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