Recording Play Time

I posted this over in Castle Paradox, and I really need an answer.
I will quote exactly as I said it:
Alright, this may be impossible (I am hoping it's not)
most professional games have a method of recording play time and
then allowing the player to view this in the menu.
Does anyone have any ideas of how to implement this??"

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-AlphaWolf Studios
contact at cckisbySPAM@gmail.com
(remove the SPAM to ensure you're not a Spambot)

Current project: Spirit Chronicles #RIFT#

It's...it's already in??? Just look at your save menu file??????

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dOn'T MiNd mE! i'M jUsT CoNtAgIoUs!!!
Play Orbs CCG: http://orbsccg.com/r/4r6x

Use hours of play, minutes of play, and seconds of play.

You can also read/write globals to keep these going over multiple save files (For use in New Game+ for instance, or maybe in tracking the time of multiple saves like in Kingdom Hearts: Birth By Sleep)