Add or Subtract Days From a Date
Find the date a set number of days before or after a starting date.
Common uses
Add or subtract days to work out a return date, a deadline, a due date, or an anniversary. For working-day-only deadlines (skipping weekends), use the business days calculator instead.
Where this comes up in real life
This is the calculator for questions like "what date is 90 days from now" or "what date was 45 days before this one" — common when tracking a return policy window, a contract notice period, a visa validity date, or a follow-up reminder. Enter a starting date and how many days to add or subtract, and the exact resulting date is calculated instantly, accounting for month lengths and leap years automatically.
Frequently asked questions
How do I find the date 30 days from today?
Leave the starting date set to today, enter 30 in the days field, and choose "add" — the resulting date appears immediately.
Can I subtract days to find a date in the past?
Yes, switch to "subtract" and the calculator will count backward from your starting date instead of forward.
Does this account for leap years automatically?
Yes. The calculation is based on real calendar dates, so any leap year (like February 29) falling within the range is handled correctly without any extra input from you.