In the exact same way that tapping the "Neptunium (Goal is 200)" shows the potential change in ELO score, could you make it so tapping the time "X hours from now" in the time machine toggles to the actual date/time relative the device clock?

you mean instead of "2 hours from now" saying something like "at 3:21pm"?

I like that idea but what if someone from China is playing someone from the USA. you would half to calculate the time difference and it would just make the game harder overall.

that's why fate suggested making it relative to the device clock.