What does the Date Difference Calculator do?

It finds the days, weeks, months and years between two dates, and can also add or subtract days from any date.

What results does it show?

The gap in days, weeks, months and years, plus a years, months and days breakdown.

Yes, free and runs in your browser with no signup.

Calculate the exact difference between two dates, or add and subtract days from a date to find a future or past date.

Difference Between Two Dates

Start Date

End Date

Add / Subtract Days

Date

Days

Operation

For the difference tool, pick a start date and an end date, then click Calculate Difference.
Read the gap in days, weeks, months and years, plus the years / months / days breakdown.
For the mini-tool, pick a date, enter a number of days, choose Add or Subtract, then click Calculate Date to see the resulting date.