Date Add/Subtract Calculator
Add or subtract years, months, weeks and days to a date and get the resulting date.
Runs in your browser. Your input is processed on your device and is not uploaded to our server.
Result
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How to use the Date Add/Subtract Calculator
- Choose the start date.
- Enter the years, months, weeks and days to add (use negative numbers to subtract).
- Read the resulting date and its day of the week.
Years and months are added first, then weeks and days. When the result would be an invalid date, such as 31 February, it is moved to the last day of the month (31 January + 1 month = 28 or 29 February). This matches how most contracts and banks treat month-end dates.
Frequently asked questions
What is 31 January plus one month?
The last day of February: 28 February, or 29 February in a leap year.