Date Calculator

How to use

1. 1Pick whether to count from today or from a specific start date.
2. 2Type the amount and choose a unit (days, weeks, months, years, hours, or minutes).
3. 3Pick Add or Subtract, or hit Flip direction to switch.
4. 4Optionally tick Count business days only to skip Saturdays and Sundays.
5. 5Read the result date with weekday, multiple formats, ISO week, and a copy-ready summary.

About this tool

Date Calculator answers the question "what date will it be in N days, weeks, months, or years?" and its mirror "what date was it N units ago?". Pick today as your starting point or set any specific start date, type how much to add or subtract, choose your unit (days, weeks, months, years, hours, or minutes), and the result appears instantly with the matching weekday, ISO format, US format, UK format, day of year, and ISO week number. Quick presets cover the most-searched cases (30, 60, 90 days from today, 6 weeks out, 1 month from today, 30 days ago, 10 business days from today) so you can jump to an answer in one click. The business-day mode walks Monday through Friday only and skips Saturdays and Sundays, useful for delivery windows, payroll, contract notice periods, and any deadline that ignores weekends. Month and year math is calendar-aware and clamps to the right end of the month, so January 31 plus one month lands on the last day of February (28 or 29 in a leap year), not on March 3 the way naive setMonth arithmetic would produce. The result panel also shows whether the resulting year is a leap year, the day of year out of 365 or 366, and how many days the result is from today, so you have full context without flipping back to a separate tool. Useful for project deadlines, contract dates, refund and return windows, payroll, course schedules, anniversaries, due dates, expiry dates, immigration paperwork timelines, and quick "what day will it be?" answers. Everything runs in your browser, in your local time zone, and nothing is uploaded to a server.

Free to use. Works in your browser. No signup, no login.