How this calculator works
Choose a start date and an end date. The start date must be on or before the end date. Elapsed counting measures the number of calendar-day steps between them; inclusive counting includes both endpoints. This tool counts calendar days, including weekends, not business days or complete 24-hour periods.
A reproducible example
Fixed example: February 28 to March 1, 2024 is 2 elapsed days, or 3 inclusive days. In 2025, the same month/day interval is 1 elapsed day because February has no leap day.
A meaningful next step
The same date gives 0 elapsed days or 1 inclusive day. Reversed ranges are rejected so that the tool does not silently change your dates. For a count that continues through today, try Days Alive or Days Together.