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Thanks for the replies. I guess the algorithm for summertime changeover varies by country. I didn't know about zdump, you have to browse the zoneinfo directory on your machine to find out what...

I have a need to calculate when British Summer Time starts and ends. After messing around, the following seems to work in Bash.

echo `date +%Y`-03-`cal 3 \`date +%Y\` | grep -oE "^[[:digit:]]{2}"...