Picture from http://www.worldatlas.com/aatlas/infopage/timezonz.htm
Q1: What's that in UTC?
A1: GMT is in the same time zone as Coordinated Universal Time (UTC)
A2: Look at the above Map.
Q2: Summer or Winter Time?
A1: Either
A2: Really ? You change your clock by two hours ?
Q3: The one I play in or the one I live in
A1: Don't know ... as you please.
A2: You can select up to two, therefore either the one, or the other, or both.