Date Difference Calculator
Find the exact time between two dates: total days, weeks, months, a calendar-accurate years/months/days breakdown — and a business-day mode that counts only working days, skipping weekends and any holidays you list.
How to use Date Difference Calculator
- Pick the start and end dates (the presets jump from today to +1 week, +30 days, or +1 year).
- Choose whether to count the end date — "Monday to Friday" is 4 days exclusive, 5 inclusive.
- Switch to Business days to exclude weekends, and paste your holidays (one date per line) to skip those too.
Frequently asked questions
- Why does the day count differ from other calculators by one?
- Counting convention: this tool is end-exclusive by default (the difference between dates), which matches subtraction. Enable "Count the end date" for inclusive counting, common for event durations and deadlines.
- How are business days counted?
- Every Monday–Friday in the range counts as a business day; Saturdays, Sundays, and any date in your holiday list are skipped.
- Is the months/years breakdown calendar-accurate?
- Yes — it borrows real month lengths instead of assuming 30-day months, so Jan 31 → Mar 1 computes correctly, leap years included.
- Do timezones or daylight-saving changes affect the result?
- No — all math runs on pure calendar dates in UTC, so a DST switch can never make a day count off by one.