Date Difference Calculator

How to use

1. Choose the start and end dates.
2. Select whether to include the end date.
3. Read or copy the difference.

Elapsed days measures the gap between the dates. Including the end date counts both selected dates. Weeks are calculated from the day total.

Calendar years and months use their actual lengths. Dates at the end of a month are adjusted to the last valid day when needed. We count complete years first, then months from that year anchor, then remaining days. The calendar difference always shows elapsed time.