How to check date if its 12 hour format or 24 hour format in PHP?

Question

I want to check the date input and convert it to 24h format. For example the datetime is:

$date="2021-02-5 11:45:00 AM"

and after i check it with this condition:

 if (preg_match("/am|pm|AM|PM/", $date))
        {
            $date=date('Y-m-d H:i:s',strtotime("$date"));
        }

and my output should be like this however it does not return a date format like that:

$date="2021-02-5 11:45:00";

How can i fix this problem?

Answer 1

You don't need regex to check if it is 24 hours or 12 hours. you can simply pass the date to strtotime function to get a timestamp of the date and then format the timestamp with date function.

$date="2021-02-5 11:45:00 AM";
$date=date('Y-m-j H:i:s',strtotime($date));
echo $date;  // 2021-02-5 11:45:00