Days Calculator
Count the days between two dates, or find the date N days before or after any day — weekdays included.
Result
0 days
0 days / 0 months and 0 days
- Excluding both start and end
- 0 days
- Including start date only
- 0 days
- Including end date only
- 0 days
- Including both dates
- 1 days
What is this tool?
A free date calculator with three modes: days between two dates, the date N days later, and the date N days earlier. Results also show the duration in weeks and months, plus inclusive/exclusive day counts.
How to use
- Choose a mode: Between dates, N days later, or N days earlier.
- Pick the dates or enter a number of days (quick choices: 7, 30, 100 and more).
- Press calculate to see the result with the weekday, then copy it if needed.
Use cases
- Finding the date 100 days from today for a deadline or event.
- Counting days until a trip, exam or anniversary.
- Checking the date 30 days before a submission deadline.
Notes
- Calculations use calendar dates and handle leap years correctly.
- All processing happens locally in your browser.
FAQ
Can I include the start or end date in the count?
Yes. Alongside the plain day count, the result shows four variants: excluding both dates, including the start only, including the end only, and including both.
Does it handle leap years?
Yes. Durations that include February 29 and year boundaries are calculated as calendar dates, so leap years are handled correctly.
Is my input sent to a server?
No. All calculations run locally in your browser.
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