Here is the number of days in each month:

Month| Days
---|---
January| 31
February| 28*
March| 31
April| 30
May| 31
June| 30
July| 31
August| 31
September| 30
October| 31
November| 30
December| 31

*February has 28 days in a common year and 29 days in a leap year (every 4 years, except years divisible by 100 but not by 400). If you want a quick way to remember, here’s a classic rhyme: "Thirty days hath September,
April, June, and November;
All the rest have thirty-one,
Except February alone,
Which has twenty-eight days clear,
And twenty-nine in each leap year."