OmniCalcsDate Difference Calculator
How long between two dates? Get days, weeks, months and years — broken down every way you need.
How to Use This Calculator
Pick two dates and the tool counts every day between them. Perfect for project deadlines, anniversaries, tenure and travel planning.
- The result is inclusive of start day, exclusive of end day — the standard "days between" convention.
- Enter either date as the earlier one; the tool handles both directions.
Frequently Asked Questions
Are the days inclusive?
The difference counts full 24-hour periods. "From Jan 1 to Jan 2" gives 1 day, matching how most booking and HR systems work.
How are months calculated?
The "years, months, days" breakdown uses calendar months directly — so Feb 15 to Mar 15 is exactly 1 month.
What if I enter the dates in reverse?
The result shows the absolute difference, so it works either way. You'll see the same number of days.
Does it count leap days?
Yes — the calculation uses real calendar days, so February 29 counts when it falls between the dates.
Practical Example
From January 1, 2026 to January 1, 2027 is 365 days — exactly 52 weeks plus 1 day — because 2026 is not a leap year. Because the count is exclusive of the end date, the result shows 365, not 366. The years, months, days breakdown reads 1 year, 0 months, 0 days.
- Enter February 15 to March 15, 2026 to see a 1-month span that counts as 1 calendar month even though February is short.
What Your Results Mean
- Total days — the number of full 24-hour periods between the two dates, counting leap days when they fall inside the span.
- Weeks / months / years — the same span expressed in calendar units for quick comparison.
- Years, months, days — the calendar-month breakdown, so Feb 15 to Mar 15 shows exactly 1 month.