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cal doesn’t offer an option to use the 1582 reform date, but looks like it does handle the 1752 adoption in Great Britain correctly: $ cal 9 1752 Septem

• madcaptenor 1y ago
  But `ncal` does offer that option. Here's October 1582 in "Italy", which didn't exist back then: $ ncal -sIT 10 1582 October 1582 Mo 1 18 25 Tu 2 19 26 We 3 20 27 Th 4 21 28 Fr 15 22 29 Sa 16 23 30 Su 17 24 31 France apparently took a couple months to get on board (or maybe just to find out): $ncal -sFR 12 1582 December 1582 Mo 3 20 27 Tu 4 21 28 We 5 22 29 Th 6 23 30 Fr 7 24 31 Sa 1 8 25 Su 2 9 26 `ncal -p` gives a list of the country codes it accepts. (These are current countries so it's a bit ahistorical for, say, Germany.) Sadly they don't implement the weird thing Sweden did in the early 18th century: https://en.wikipedia.org/wiki/Swedish_calendar https://en.wikipedia.org/wiki/Swedish_calendar