Date & Days Difference Calculator

Calculate days between dates, weekdays, weekends, or add/subtract time intervals

Choose Dates

Exact Duration

Total Days Difference

365 Days

1 Year, 0 Months, 0 Days
Weekdays (Mon-Fri)

261

Weekend Days (Sat-Sun)

104

Total Weeks

52.1

Working with Calendar Dates & Intervals

A date difference calculator is essential for legal contract deadlines, project milestone tracking, interest computation periods, visa stay calculations, and countdowns.

Frequently Asked Questions

Does this account for Leap Years?
Yes, our date calculations use the exact Gregorian calendar rules, fully accounting for February 29th leap days across past and future centuries.

How to Use the Date Calculator

  1. Choose between Duration Between Dates or Add/Subtract Days mode.
  2. Select the Start Date and End Date using the calendar pickers.
  3. Click Calculate Date Difference to view total days, weeks, months, years, and business days.

Calendar Math Methodology

Total Days = (End Timestamp - Start Timestamp) / (1000 × 60 × 60 × 24)

Practical Step-by-Step Example

From January 1, 2026 to July 4, 2026:

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