Date Duration Calculator
Choose two dates.
Two ways to count
“Days between” measures elapsed midnights and excludes the starting date. Inclusive count treats both selected dates as part of the interval.
What it does not know
The calculator does not interpret contracts, legal deadlines, time zones, cutoff times, holidays or business-day definitions.
ImportantResults are planning estimates produced from the values you enter. Verify any deadline, safety requirement, product wait, legal period, service life or professional requirement with the source that governs your situation.
Improve the estimate
After the task is complete, compare actual active time, waiting time and elapsed time with your inputs. Updating your own rates is one of the simplest ways to make future estimates more useful.