How to convert the time from AM/PM to 24 hour format in PHP?

If you use a Datetime format see http://php.net/manual/en/datetime.format.php

You can do this :

$date = new \DateTime();
echo date_format($date, 'Y-m-d H:i:s');
#output: 2012-03-24 17:45:12

echo date_format($date, 'G:ia');
#output: 05:45pm

Try with this

echo date("G:i", strtotime($time));

or you can try like this also

echo date("H:i", strtotime("04:25 PM"));

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