The first entry in the europe zone file for Ireland is as follows: Rule GB-Eire 1916 only - May 21 2:00s 1:00 BST However I don't think it's correct. I'm not sure how far back we want to go, but apparently from 1880 up until October, 1916, Dublin was 25 minutes off from London. When the clocks were set back in October 1916, they were set back 35 minutes - which would seem to cast doubt on the second line for GB-Eire: Rule GB-Eire 1916 only - Oct 1 2:00s 0 GMT And 25 minutes, as noted in the file was an oversimplification. A web page with more detail is here (I've cc'd Dave who might have more info): http://www.maths.tcd.ie/~dwmalone/time/dunsink.html And apparently there were places in Ireland observing the Dunsink based "Dublin Mean Time" up to the 1940s: http://historical-debates.oireachtas.ie/D/0079/D.0079.194003050027.html In addition, Belfast seems to have had yet another timezone. How did the British actually manage to build an empire anyway? Kevin -- Kevin Lyda Dublin, Ireland US Citizen overseas? We can vote. Register now: http://www.votefromabroad.org/