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> (Speaking of leap seconds, who thought seconds going from 0 - 60 rather than 0 - 59 was a good idea?)

Who thought February going from 1-29 instead of 1-28 was a good idea?

I don't understand why everyone seems to believe that the phenomena are so inherently different.

Because other months went to 30 or 31 already, so there was room for it in calendars and people never assumed months are always the same length.

60 seconds in a minute, OTOH, is a very strong assumption in many systems and people's minds.

> other months went to 30 or 31 already, so there was room for it in calendars and people never assumed months are always the same length

I really don't think this has much to do with it. It would predict no problems trying to add a November 31 to some year; I tend to make the opposite prediction.

Remember February 30 1712? https://en.wikipedia.org/wiki/February_30#Swedish_calendar

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