30 Days Hath September
Thirty days hath September,
April, June, and November.
All the rest have thirty-one,
Excepting February alone,
And that has twenty-eight days clear,
And twenty-nine in each leap year.
For other versions and the "knuckles" method for remembering month lengths, visit this Wikipedia article.
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Spreadsheet and Adobe Acrobat versions converted by amateur genealogist John A. Blair.
Czech language version translated by kalendar.beda.cz.
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