The puzzle is 52 (16) 43 nothing is hard about it
these could be the Lat longs:
either: 52 16.43 = Poland -> UTC +2
or : 52.16 43 = Belarus -> UTC+3 (or another continent, Russia)
if you meant that your time was 16:00
then it is UTC+5 (another continent)
I like you guys' answers, Yekaterinburg and Poland. Lat long 52.16 63 is still in Biskupice-Poland, right? Why Belarus? Anyway, your answers are not correct though. :'D I could see that your solutions (except momonosuke's pure guess, UTC-8 :'D) are perfectly logical in every single way. However, you should have removed UTC+8, UTC+10, UTC+2, UTC+3, and UTC+5 from the possible solutions though as I have already said that these were incorrect.
Here, the solution:
48, 12, 39
44, 8, 35
46, 10, 37
52, ?, 43
The missing number that fit in ? is 7.
The number in the middle of each triple is the same as the digits of either end number when added together. 4+8=12=3+9 and so on.
So, yeah, I'm at the moment in UTC+7. :'D