This question already has an answer here:
How to convert hour:minutes to seconds in php? I want to convert this value example: 6:30 (6 hours 30 minutes).
echo gmdate("H:i", 11685); // this is to convert seconds to hours:minutes
I need reverse for this..
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Just split it up and do the math, not hard.
list($hours, $minutes) = explode(':', $time, 2);
$seconds = $minutes * 60 + $hours * 3600;