Bandit, I'll give you a tip. Never use GMT offsets unless you're solely talking about Europe! UTC offsets are better for most purposes. GMT goes along with European daylight saving time (DST), so in winter, GMT is UTC, but in summer, GMT is UTC+1. That messes up the offsets related to countries that don't use DST, for example, China (in UTC+8 year-round) is in GMT+8 in winter and GMT+7 in summer. I'm saying all this because I once got into quite a mess because I didn't know the difference between GMT and UTC.
On-topic: I live in Estonia, so UTC+2 in winter and UTC+3 in summer.