Day Counter
Enter a start and end date to get the number of days and weeks between them, optionally including the end day.
Input Data
The starting date (YYYY-MM-DD).
The ending date.
Results
0
0
At a glance:The day counter subtracts the start date from the end date to get the day difference; with 'Include End Day' the total adds 1. Weeks = total days ÷ 7.
Formula
days = floor((endDate - startDate) / 86,400,000 ms).
If includeEndDay: days = days + 1.
weeks = days / 7.
How to Use
- Enter the start and end dates.
- Optionally check 'Include End Day' to count both ends.
- Get days and weeks instantly.
FAQ
What does 'Include End Day' mean?
When checked, the end day itself is counted (total +1), used for rentals, treatments and other inclusive periods.
Can the day count be negative?
If the end date is earlier than the start date, the result is negative, meaning a countdown to a past date.
Related Tools
References
Content reviewed by the Calculatorism editorial team. Results are for reference only; please refer to the relevant authorities for the official figures.