CalcInfinity

Date Difference Calculator

Enter a start and end date to see exactly how far apart they are — in years, months, days, and weekdays.

—years
—months
—days

Worked Example — December 4, 2023 to February 9, 2026

2 years, 2 months, 5 days798 total days · 114 weeks

Frequently Asked Questions

Total days is simply the number of calendar days between the two dates. The years/months/days breakdown works differently — it finds the largest whole number of calendar months that fit between the dates, then measures whatever's left over in days, so month-end dates (like January 31st to March 1st) come out correct rather than rounded.

Common Mistakes to Avoid

  • Total days isn't the same as years × 365. Leap years and varying month lengths mean a simple years-times-365 estimate drifts from the real day count — this calculator counts the actual calendar days between the two dates.
  • This isn't for spreadsheet formulas. If you need a DATEDIF or date-difference formula inside Excel, Google Sheets, or SQL itself, that's a different task than using a standalone calculator — this page computes the result directly, it doesn't generate formula syntax.

References

  • Gregorian calendar (ISO 8601)

Last reviewed July 2026

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