Enter values and select Calculate to see your result.
Days Between Dates
Choose any two dates to calculate the elapsed number of calendar days and approximate weeks.
How to use the Date Difference Calculator
Count calendar days and approximate weeks between two dates.
- Enter start and end dates.
- Check the order of the interval.
- Calculate elapsed days and weeks.
Date Difference Calculator formula
Elapsed days are calendar-date difference; approximate weeks equal days ÷ 7.
Worked example
Inputs: January 1, 2026 to January 31, 2026.
What to expect: The interval is 30 elapsed days, or about 4 weeks and 2 days.
How to read your result
Whether both endpoints count depends on the question; keep the convention consistent.
Frequently asked questions
Does it count both dates?
It reports elapsed difference; add one day for an inclusive count.
Does it handle leap days?
Yes. It uses the actual calendar dates.