Use time counter Chest

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Hi everybody !

I'm doing a 2d Game with photon and i want to know if it's possible to check the "real" time.

I want to do a 24h counter chest , but i don't want to use the time of the smartphone, it's to easy to cheat!

So i want to know if there is a way to check the real Time or something like that ? :/

Thx for you're help !