[5] By the Renaissance, the irregularity of the resulting system had inspired Latin verses to remember the order of long and short months.
The first known published form[6] appeared in a 1488 edition of the Latin verses of Anianus:[7] Junius Aprilis September et ipse November Dant triginta dies reliquis supadditur unus De quorum numero Februarius excipiatur.
[6][7] June, April, September, and November itself Give thirty days, the rest add one more, From which number February is excepted.
Of xxviij is but oon And alle the remenaunt xxx and j[10] Thirty days have November, April, June, and September.
[1] The early versions tended to favour November and as late as 1891 it was being given as the more common form of the rhyme in some parts of the United States.
[17] An alternate version of this verse, published in 1827, runs: Thirty days hath September, April, June, and November; All the rest have thirty-one, Excepting February alone.
[18] Another version, published in 1844, runs: Thirty days has September, April, June, and November; All the rest have thirty-one, Excepting Feb-ru-a-ry alone, Which has twenty-eight, nay, more, Has twenty-nine one year in four.
[14] In the c. 1601 academic drama Return from Parnassus, Sir Raderic's overenthusiastic appreciation of its poetry[21] is of a piece with his own low level of culture and education.
"[10] On the other hand, the unhelpfulness of such an involved mnemonic has been mocked, as in the early-20th-century parody "Thirty days hath September / But all the rest I can't remember.