There were a few e-mail messages on the FtB backchannel a little while ago. An FtB blogger who lives in Ireland was wondering when the next FtB Podish-Sortacast will happen (https://proxy.freethought.online/pharyngula/2024/03/09/in-my-prime/, scroll down a bit), probably just under an hour from when I get this posted.
That got me to thinking about civil time in the Irish Republic. It winds up that they observe the same time as Great Britain and Northern Ireland, except they get there with rather tortured reasoning.
In the U.K., they switch from “Greenwich Mean Time” (GMT, same as UTC+0) to “British Summer Time” (BST, UTC+1) on the last Sunday in March at 01:00:00 local wall clock time, and they switch back from BST to GMT on the last Sunday in November at 02:00:00 local wall clock time.
In Ireland, they switch from ”Irish Standard Time” (IST, UTC+1) to GMT on the last Sunday in November at 02:00, and they switch back from GMT to IST on the last Sunday in March at 01:00.
Yes, really. Go figure.
The POSIX TZ environment variable for Europe/London: GMT0BST,M3.5.0/1,M10.5.0
The POSIX TZ environment variable for Europe/Dublin: IST-1GMT0,M10.5.0,M3.5.0/1
Why did they bother?