Date Calculator
Add or subtract days, weeks, months and years from any date. Find the date 30, 60 or 90 days from today, or any date in the past.
About the Date Calculator
The date calculator adds or subtracts any number of years, months, weeks and days to a starting date. Use it to find a deadline that is 90 days away, the end date of a notice period, a warranty expiry date, or the date a certain number of weeks ago.
How to Use the Date Calculator
- Choose a start date (today is filled in for you).
- Select Add or Subtract and enter the years, months, weeks and days.
- Press Calculate to get the resulting date and the day of the week.
Formula and How It Works
Years and months are added first. If the resulting month is shorter than the starting day (for example 31 January plus one month), the date is moved to the last day of that month. Weeks are converted to days (1 week = 7 days) and days are added last.
Frequently Asked Questions
What date is 90 days from today?
Enter today as the start date, choose Add, type 90 in the Days field and press Calculate. The answer changes every day, so the calculator always uses the current date.
Does the calculator count leap years?
Yes. It uses the real calendar, so February has 29 days in leap years and every month has its correct length.