Overview
This calculator answers everyday calendar questions: how many days are in this month, how many in the year, whether February has 29 days, and which weekdays start and end the month.
Formula
Month lengths follow the Gregorian calendar: 31 days for some months, 30 for others, and 28 or 29 for February. A year has 365 or 366 days.
How it works
Enter the year
Any year from 1 to 9999.
Choose the month
From January to December.
Read the details
Day count, first and last weekday, and leap status.
Worked examples
February 2024
A leap year, so February has 29 days.
February 2026
Not a leap year, so February has 28 days.
Frequently asked questions
Why does February change length?
The Gregorian year is about a quarter day shorter than the solar year, so a day is added every four years.
Is every year divisible by 4 a leap year?
No. Century years not divisible by 400 are not leap years, such as 1900.
Does it support Hijri months?
No, this tool is Gregorian. Use the Hijri converter for Hijri months.
This calculator is for educational and informational purposes only and is not a substitute for professional advice.