Days in Month Calculator
Find days in a month (leap-aware).
Calculate days in any month instantly. Free days-in-month checker with weekdays count.
Calculator Inputs
About Days in Month
Find days in a month (leap-aware).
Handles 28/29/30/31 including leap years.
Where it is used
Payroll, planning, billing.
How to use the Days in Month
- Month — enter the value.
- Year — enter the value (e.g. 2026).
- Calculate — press the Calculate button to see the result instantly above.
Formula
new Date(year, month, 0).getDate()
Examples
Feb 2026
month:2
year:2026
Result: February 2026 has 28 days
Frequently Asked Questions
- Leap year?
- Feb has 29 days if year is divisible by 4 (except centuries not by 400).