Thirty Days hath September

I had memorized this poem as a girl, to help me with the days of each month. As I learned it, I would get stuck around February and then the rhyme of the poem sort of fell apart:

Thirty days hath September,

April, June, and November

All the rest have thirty-one,

Except for February; it alone has twenty-eight,

and in a leap year it has twenty-nine.

It was fun to find this article, with some better endings!

Except for February alone...

Which hath twenty-eight days clear,
And twenty-nine in each leap year,
or
Which has eight and a score
Until leap year gives it one day more,
or
Which hath but twenty-eight, in fine,
Till leap year make it twenty-nine.