Everyday & Conversions
Date to Date Duration Calculator
Count the days, weeks, months and years between any two calendar dates, with real month lengths and leap years.
Your inputs
Change any value to update the result instantly.
Days between
358 days
Calendar span
0 years, 11 months, 24 days
Weeks
51.14 weeks
Hours
8,592 hours
Minutes
5,15,520 minutes
Direction
End date is later
What this calculator does
Measures the span between two calendar dates.
What your result means
Days between the dates, plus the same span in weeks, hours and as years/months/days.
Formula and working
Days between = end date − start date (Gregorian calendar, real month lengths)
- 1
Collect the inputs
Start date = 2026-01-01; End date = 2026-12-25; Count the end date too? = 0
- 2
Apply the formula
Days between = end date − start date (Gregorian calendar, real month lengths)
- 3
Result
Days between = 358 days
Frequently asked questions
Symbols and assumptions
- D₁
- Start or birth date on the Gregorian calendar
- D₂
- Reference or end date
- Δd
- Whole days between the two dates
- • Proleptic Gregorian calendar with real month lengths (28, 29, 30 or 31 days).
- • Leap years follow the rule: divisible by 400, or by 4 but not by 100.
- • Dates are handled in UTC so a device time zone cannot shift a calendar day.
Sources and review
Reviewed 2026-09-22 · Next review 2027-09-22
- • Dates before 15 October 1582 used the Julian calendar in most of Europe and are outside the intended range.
- • Clock-time results ignore daylight-saving transitions unless the tool asks you to set them.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
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