Days in Month Calculator
Return the number of days in a specific month and year, accounting for leap years.
Assumes the Gregorian calendar; historical calendars may differ.
Examples
- February 2024 ⇒ 29 days
- April 2025 ⇒ 30 days
FAQ
How are leap years handled?
JavaScript's Date object automatically adjusts for leap years.
What range of years is valid?
You can use any Gregorian calendar year.
Do I enter month numbers or names?
Enter month numbers 1 through 12.
Why use day 0 in the formula?
Setting day 0 returns the last day of the previous month.
Additional Information
No additional information available.