Day Counter
Count the number of days between two dates. Includes weekends or exclude them for business calculations.
Date Difference
Difference
- years:0
- months:0
- weeks:0
- days:0
- hours:0
- minutes:0
- seconds:0
Business Days
0
Weekdays excluding weekends
Day counter
Formula
Count all days (including weekends) between two dates.
The division by 86,400,000 converts milliseconds to days.
Worked example
Count days from 1 January 2025 to 15 January 2025:
- 1 Jan to 15 Jan = 14 days
Count days from 1 January 2025 to 1 February 2025:
- January has 31 days
- 1 Jan to 1 Feb = 31 days
How to use
- Enter the start date
- Enter the end date
- Click "Calculate" to see the day count
Inclusive vs exclusive
This tool counts days exclusive of the end date. To count inclusively (including both start and end dates), add 1 to the result.
Elapsed days
The day counter gives you elapsed time in days, useful for:
- Tracking project progress
- Calculating aging of accounts
- Monitoring deadlines
- Planning and scheduling
Common use cases
- Calculating age in days
- Tracking fitness goals (streaks)
- Monitoring inventory aging
- Scientific experiments with daily intervals
- Historical date calculations
FAQ
Can I count backward? No, the end date must be after the start date. Swap them for the reverse calculation.
How many days in a year? 365 days, or 366 in a leap year.
Is 2025 a leap year? No. The next leap year is 2028. A year is a leap year if divisible by 4, but not by 100 unless also by 400.
What about time of day? This tool works with dates only. For time-of-day calculations, use the duration calculator.
Can I export the results? Copy the results manually. This is a client-side tool with no backend storage.