How to calculate days between dates
Elapsed days = end − start Inclusive days = elapsed days + 1 Date offset = years, then months, then weeks × 7 + days
Worked example. Days between: 358 days.
Example inputs — Calculate: Days between dates; Start date: 2026-01-01; End date: 2026-12-25; Include end date: No. Starting values are illustrative.
0 years, 11 months, 24 days elapsed
From George Guju, founder of Calculyn · Educational calculator guidance, not professional advice.
How it works
Count actual calendar days between two dates, optionally including the end date. Add or subtract years, then months, then weeks and days. Month-end dates clamp to the last valid day. Weekdays exclude weekends only, not public holidays.
Assumptions & limitations
- Results are rounded for display.
Formula and assumptions reviewed October 2026 by the Calculyn team. How we build our calculators
Frequently asked questions
Is the end date included?
Choose Include end date to count both dates. By default the end date is excluded.
Are public holidays excluded?
No. The weekday count excludes Saturdays and Sundays only.