Days in Month Checker
Check how many days are in any given month and year.
How many days this month
Months have different lengths, and February's varies with leap years, so the number of days in a given month is not always obvious. This tells you how many days any month has, for any year.
Choose a month and year to see its number of days.
The irregular months, and the old rhyme
The uneven month lengths are a quirk of calendar history, which is why generations have relied on the rhyme about thirty days having September, April, June and November, with the rest having thirty-one except February. That short one, February, is the interesting case: it has twenty-eight days most years and twenty-nine in a leap year, which is how the calendar absorbs the extra day needed to stay aligned with Earth's orbit. Knowing the exact days in a month matters for scheduling, billing cycles, counting deadlines and any date arithmetic, since assuming a standard month length quietly introduces errors. The irregularity is a small inconvenience we have inherited, and having the exact count for a specific month and year removes the guesswork, especially around February in years you are not sure about.
Frequently asked questions
Which months have 31 days, and which fewer?
Seven months have 31 days; April, June, September and November have 30; and February has 28, or 29 in a leap year.
Why does February vary?
It has 28 days most years and 29 in a leap year, which is how the calendar absorbs the extra day needed to stay aligned with Earth's orbit.
Is anything uploaded?
No. The calculation happens in your browser.