Date Duration Calculator
This date calculator finds the exact duration between a start and end date - in days, weeks, months, and years.
Last updated: August 30, 2026
Frequently asked questions
How many days are between January 1 and December 31, 2024?
365 days - 2024 is a leap year, but since the range doesn't cross into a new year past the leap day cutoff for this specific pair of dates, the count is a standard 365.
Does this calculator count the start or end date?
It counts the number of full days elapsed between the two dates - the start date itself is day zero, not day one.
Does this account for leap years?
Yes - it works directly from real calendar dates rather than assuming a fixed 365-day year, so a February 29 falling between your start and end date is counted correctly without any extra adjustment.
Can this calculate duration in months and days, not just total days?
Yes - alongside the total number of days between two dates, this calculator breaks the duration down into years, months, and days, which is more intuitive for spans longer than a few weeks than a single large day count.
Is a 'day to day calculator' the same as this date duration calculator?
Yes - "day to day calculator" describes finding the span between two calendar dates, which is exactly what this tool does. Enter a start and end date above to get the exact number of days, weeks, months, and years between them.
Is 'day between days' the same search as 'days between dates'?
Yes - both describe finding the span between two calendar dates, which is exactly what this tool does.