Date Calculator

Find the difference between two dates or add and subtract years, months and days.

—Duration
—Total days
—Weeks
—Weekdays

"Weekdays" counts Monday–Friday between the two dates (inclusive of the start, exclusive of the end). Useful for working-day estimates.

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How to use Date Calculator

Three quick steps — no sign-up needed

  1. Step 1

    Choose a mode

    Select Difference between dates or Add / subtract from a date.

  2. Step 2

    Enter the dates or offsets

    For difference, set start and end. For add/subtract, set a base date, operation, and years/months/days.

  3. Step 3

    Read the result

    See the span between dates or the new calendar date after the offset.

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About Date Calculator

Date Calculator finds how many days lie between two dates, or adds and subtracts years, months, and days from a base date. Project planners searching "days between dates", "add days to date", or "date difference calculator" use this for deadlines and schedules.

Pick Difference between dates (start + end) or Add / subtract from a date (base date, Add or Subtract, then years, months, days). Month-end edges (for example Jan 31 plus one month) follow common calendar rules - always verify critical legal deadlines on an official calendar.

Time zones and "business days only" rules are not applied unless a separate tool covers them. Inclusive vs exclusive day counts can matter for contracts - confirm the convention your document uses.

A calendar arithmetic helper, not legal advice on notice periods.

Benefits of Date Calculator

Two modes Span between dates or offset from a base date.
Years, months, days Offset with mixed units, not only total days.
Clear scheduling math Useful for project and personal planning.
Browser-based No spreadsheet date formulas required.

Frequently asked questions

How do I find days between two dates?

Choose Difference mode, enter start and end dates, and read the span.

How do I add 30 days to a date?

Choose Add/subtract mode, set the base date, operation Add, and days to 30.

Are weekends excluded?

No - this counts calendar days unless you adjust manually.

What happens at month ends?

Calendar month arithmetic applies; check edge cases for bills and contracts.

Is this legal deadline advice?

No - verify official deadlines with the relevant authority.