Uncommon
Thirty Days Hath September
Traditional mnemonic verse
Thirty Days Hath September
"Thirty Days Hath September", or "Thirty days has September", is a traditional verse mnemonic used to remember the number of days in the months of the Julian and Gregorian calendars. It arose as an oral tradition and exists in many variants. It is currently earliest attested in English, but was and remains common throughout Europe as well. Full: An alternative version goes: April, June and November all the rest have 31 but February has 28 we done. An alternative version goes:
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