Regarding March 1st, I found this:
Quote:
Saint David's Day
Historically, March 1st was considered to be the beginning of the year. The names of some months reflect this. (September = Seventh, October = Eighth, November = Ninth, December = Tenth). (see New Year) If the days of the year were counted from March 1, till the next March 1, each date of the year would have the same number every year, unlike counting from January 1.
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