Date calculator (add / subtract)
Pick a date and add or subtract days, weeks, months or years.
Date calculator
Add or subtract days, weeks, months or years from any date and get the resulting date. Useful for deadlines, due dates, contract terms, return windows and reminders. It runs entirely in your browser.
How to use it
Pick a start date, choose add or subtract, type the amount and select the unit. The result updates instantly. For day and week math the count is exact; month and year math follow the calendar, so adding 1 month to 31 January rolls into early March.
Frequently asked questions
How do I add 90 days to a date? Pick the date, choose “Add”, enter 90 and select “days”.
Does it count business days? No — this counts calendar days. For working days use the work-days calculator.