Question

What the best way to convert 24 hours time to seconds so it can be used for comparison if statement..

function HourMinuteToDecimal($hour_minute) {
        $t = explode(':', $hour_minute);
        return $t[0] * 60 + $t[1];
}

echo HourMinuteToDecimal("23:30");
return 1410

If you try to convert midnight time (00:00) to seconds, it will not work. What is the solution to this?

00:00, 00:30, 01:00, 01:30, etc.

if (HourMinuteToDecimal("01:30") > HourMinuteToDecimal("23:30")) { .. } 

This will not work.

Answer 1

To convert function:

function hoursToSecods ($hour) { // $hour must be a string type: "HH:mm:ss"

    $parse = array();
    if (!preg_match ('#^(?<hours>[\d]{2}):(?<mins>[\d]{2}):(?<secs>[\d]{2})$#',$hour,$parse)) {
         // Throw error, exception, etc
         throw new RuntimeException ("Hour Format not valid");
    }

         return (int) $parse['hours'] * 3600 + (int) $parse['mins'] * 60 + (int) $parse['secs'];

}

Write on the fly, no tested 😛

so, you can use strtotime to convert the format date in unix timestamp and comparte using a standar operators (== < > >= <= !=, etc) ex:

$t1 = "23:40:12";
$t2 = "17:53:04";

$h1 = strtotime("0000-00-00 $t1");
$h2 = strtotime("0000-00-00 $t2");

$h1 == $h2; // if are equals
$h1 > $h2; // if h1 is mayor at h2
$h1-$h2; // dieference in seconds, etc.

etc..