Detct Nighttime with Sunrise/Sunset - NOT WORKING

This site is best viewed in a modern browser with JavaScript enabled.

Detct Nighttime with Sunrise/Sunset - NOT WORKING

DaAwesomeP

Why won't this work?

$date_sun_info = date_sun_info(time()[COLOR=#000000][COLOR=#0000BB][/COLOR][/COLOR], 38.4, -9);
$time_YmdHis = date("YmdHis", time());
$sunrise_YmdHis = date("YmdHis", $date_sun_info['sunrise']);
$sunset_YmdHis = date("YmdHis", $date_sun_info['sunset']);

if (($sunset_YmdHis <= $time_YmdHis) && ($time_YmdHis <= $sunrise_YmdHis)) {
            echo "night";
}

If it is the nighttime (after sunset and before sunrise) it should output "night". But it doesn't. There are no errors in the log.

unasAquila

your checking that sunset and sunrise are true which is a false value, you need to check the or value ||

if (($sunset_YmdHis <= $time_YmdHis) || ($time_YmdHis <= $sunrise_YmdHis)) {
            echo "night";
}

DaAwesomeP

I instead saw it was more practical to use Javascript in the situation and found this library: https://github.com/mourner/suncalc. Thanks for your help anyways.

priyankagound

Below is the example code for date_sunset:

<?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);

Now, for Day and night try out with the another code given below:

<?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";

}
?>

Hope this helps.

DaAwesomeP

Thanks, but as I said above, I found a better library in Javascript (https://github.com/mourner/suncalc) that can process more data. Also, I am on a very limited CPU and memory server (it's an internal site), and for simple math like this, it makes more sense to do it Client-Side.