Date Difference Calculator - Days Between Dates & Time Duration
Calculate exact duration between two calendar dates in total days, weeks, months, and years with accurate leap year handling.
This tool runs in your browser.
Your result will appear here.
How to use
- 01Pick the start date and end date from the calendar selectors.
- 02Choose whether to include the end date as a full calendar day.
- 03View total elapsed days, completed weeks, calendar months, and day breakdowns.
FAQ
Does the calculator include both the start and end dates?
The default arithmetic represents the duration delta (End Date - Start Date). For calendar day totals including both boundaries, simply add one day.
How are months and years of varying lengths reconciled?
The calendar engine computes full completed calendar years, intervening completed calendar months, and remaining residual days accurately.
What are common practical applications for this tool?
Common uses include computing legal contract durations, milestone countdowns, visa stay allowances, project timelines, and age intervals.