Days Between Dates Calculator
Calculate the interval between a start and end date in days, weeks, months, years, hours, minutes, seconds and approximate weekdays. The calculator also includes clear DD.MM.YYYY input, empty-state handling, a duration score, quick interpretation and scenario analysis.
Calculate Date Difference
For basic use, enter the start and end dates. Optional times make the interval more precise down to hours, minutes and seconds. Results update automatically.
Quick note
If the time fields are blank, 00:00:00 is used. The weekday count is an estimate that excludes weekends only; public holidays are not subtracted.
Scenario Analysis
See how the total interval changes if the end date moves 7 days later or earlier.
What does this calculator do?
The Days Between Dates Calculator shows the interval between a start and end date. In addition to total days, it presents weeks, approximate months and years, and an estimated weekday count.
It is useful for delivery planning, due-date tracking, leave periods, project timing, and measuring elapsed time between two events down to hours, minutes and seconds.
How is the difference between two dates calculated?
The calculator subtracts the start date/time from the end date/time. If times are entered, the result is precise to the second. It then expresses the interval as weeks, approximate months and years, weekdays, and total time units.
Weekdays = Approximate days excluding Saturdays and Sundays
Frequently Asked Questions
Can I calculate without entering times?
Yes. Entering only the two dates is enough for the basic interval. If the time fields are blank, both dates are treated as 00:00:00.
Is the weekday count an official business-day count?
No. The calculator excludes Saturdays and Sundays to provide an approximate weekday count. Public holidays are not removed.
Can the start and end date be the same?
Yes. The interval can be zero days. If times are entered, the calculator can still show an hours, minutes and seconds difference within the same date.
What happens if the end date is before the start date?
The calculator shows a validation error. The end date/time must be the same as or later than the start date/time.