How to find out the Real Geographical Time, as in my application I want to attach the real time with my application.

So that if the user changes the time in his device then I should get only the real prevailing time - NOT THE DEVICE TIME

My question is much confusing but try to understand in a simple language -

I dont want DEVICE TIME, I want REAL PREVAILING TIME at any instant

android datetime real-time time-format
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