Month Calculator

Add or subtract months from a date.

Start dateMonths (negative to subtract)

Frequently asked questions

What if the target month is shorter?

The date moves to the last day of that month, so Jan 31 plus one month is Feb 28.

Calculate your exact age in years, months and days, plus the days until your next birthday.

Find the exact difference between two dates in years, months and days.

Add or subtract years, months, weeks and days from any date.

Measure the exact duration between two dates and times.

Count working days between two dates, excluding weekends and holidays.

Count the exact number of days between any two dates.