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GMT is wrong
Ah, this is Template:times. I can certainly add the simple BST change if that's what you want, but it still won't be 100% accurate:
BST begins at 01:00 GMT on the last Sunday of March and ends at 01:00 GMT on the last Sunday of October.
In the northern parts of the time zone, during the second Sunday in March, at 2:00 a.m. EST, clocks are advanced to 3:00 a.m. EDT leaving a one hour "gap." During the first Sunday in November, at 2:00 a.m. EDT, clocks are moved back to 1:00 a.m. EST, thus "duplicating" one hour. Southern parts of the zone (Panama and the Caribbean) do not observe daylight-saving time.
TL;DR: time zones suck. I don't think it will be easy to find a good solution. Let me know if you just want the simple one or feel free to brainstorm another.