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Date Calculator

Calculate days between dates, add or subtract days from a date, and look up day of week, week number, and more. Supports business days.

FreeNo SignupNo Server UploadsZero Tracking

Calculator Mode

Select Two Dates

Results

Total Days

91

Weeks + Days

13 weeks, 0 days

Business Days

65

Total Hours

2,184

Export
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How to Use Date Calculator

  1. 1

    Choose a mode

    Select 'Days Between Dates', 'Add/Subtract Days', or 'What Day Is It?' for different calculations.

  2. 2

    Enter dates

    Enter one or two dates depending on the mode you selected.

  3. 3

    Adjust options

    Toggle business days to exclude weekends, or switch between adding and subtracting days.

  4. 4

    View results

    See total days, weeks, business days, day of week, week number, and more.

Frequently Asked Questions

Business days exclude Saturdays and Sundays. Public holidays are not excluded — for holiday-aware calculations, you would need to account for your specific country's holidays.

The ISO week number follows the ISO 8601 standard where weeks start on Monday. Week 1 is the week containing the first Thursday of the year.

Yes. The calculator correctly handles leap years (years divisible by 4, except centuries not divisible by 400) when counting days.

The calculator works with any valid date your browser supports, typically going back several centuries and forward into the future.