This short poem summarizes the number of days in each month of the year. It notes that September, April, June and November each have 30 days, while the rest have 31 days. It also mentions that February has 28 days, except in leap years when it has 29 days.

1. Song of months
Thirty days has September, April, June, and November. All the rest
have 31, Feabruary stands alone, that has 28 days clear and 29 in
each leap year.