It's easy to determine: just google "time zone" followed by your country name.
If you county is in UTC + 7 than just reverse the sign: deduce the 7 hours from midnight:
In the UTC + 7 zone, New Year will be at 5 PM UTC: midnight minus 7 hours.
This question was inspired by the knowlegde that in some countries in the Pacific it would already be New Year (here in Belgium it's 1 PM now).
We're in UTC+1 to 11 PM UTC will be New Year :D