Add or Subtract Days from a Date — Date Calculator
Add or subtract days, weeks, months, years or working days from any date to find the result. Free, no sign-up, and your files never leave your device.
Free, with no sign-up and no watermark. The file is processed in your browser and never uploaded.
Add or subtract days, weeks, months, years or working days from a date to find the resulting date and weekday — useful for due dates, deadlines and validity periods.
Step by step
- Choose the start date: Pick it in Start date.
- Add or subtract: Choose Add or Subtract and type the Amount.
- Pick the unit: Select Days, Weeks, Months, Years or Working days (then choose the weekend).
- Read the date: The resulting date appears with its weekday; Copy gives it in YYYY-MM-DD form.
Handy for
Payment due dates
Find the date 30 or 45 days after an invoice.
Document validity
Work out when a 6-month certificate expires.
Project planning
Count 10 working days forward from today.
Pregnancy and health
Add weeks to a date to plan appointments.
Good to know
Adding months keeps the day of the month where possible; 31 January + 1 month lands on the last day of February.
Questions
Does “working days” skip holidays?
It skips the weekend days you choose, not public holidays, which vary by region.
Is anything sent to a server?
No. Every calculation runs in your browser, so the numbers you type never leave your device. The page keeps working offline once it has loaded.
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