Date Difference Calculator

Enter a start date and an end date and the calculator instantly shows the total number of whole calendar days between them, along with the same span expressed in weeks, months, and years.

It converts both dates to midnight in your local time zone and subtracts them to get total days. For weeks, it divides total days by 7 and shows the remainder. For months and years, it uses calendar-aware subtraction (like the one used for age calculations) rather than a fixed day-count average.

The 'Weeks' result divides the total day count by 7 and shows both the whole number of weeks and the leftover days, e.g. '52 weeks, 1 day' for a 365-day span.

No. If you enter an end date earlier than the start date, the calculator automatically swaps them so the difference is always shown as a positive span, and it notes that the swap happened.

The 'Months & Days' row shows total elapsed months (which can be more than 12, e.g. '14 months, 3 days'), while the 'Years, Months & Days' row breaks that same span down further into complete years plus the remaining months and days — both are calendar-aware, just expressed at different granularities.

Yes. Because the calculator works with actual calendar dates rather than a fixed 365-day year, leap years (like 2024, 2028) are automatically accounted for in every unit — days, weeks, months, and years.

This calculator counts every calendar day, including weekends. If you need to exclude weekends and holidays, use the dedicated Business Days Calculator instead.