Method
Elapsed days are the UTC date difference divided by 86,400,000 ms; inclusive counting adds one when start and end are ordered.
Everyday worksheet
Day Counter
Count calendar days, inclusive dates, full weeks and weekdays between two UTC-normalized dates.
The calculation runs locally. Results include the intermediate values, unit conversions and assumptions needed to audit the answer.
Method, assumptions and practical use
How the Day Counter works
Elapsed days are the UTC date difference divided by 86,400,000 ms; inclusive counting adds one when start and end are ordered. Inputs stay in this browser, and the result table exposes conversions and assumptions for independent checking.
Interpret the result
Elapsed-day count measures boundaries crossed, while inclusive count measures dates touched.
Check the assumptions
Weekday count excludes Saturdays and Sundays only; it does not know public holidays.
Local calculation
Everything runs in this browser. Inputs are not sent to an external calculator.
Rounding
Displayed values may be rounded for readability while calculations use full floating-point precision unless the tool explicitly uses exact integers.
Scope
Weekday count excludes Saturdays and Sundays only; it does not know public holidays.
Simple by design
Three steps to a clearer number.
Enter your details
Use realistic values in each field. You can change them anytime.
Calculate instantly
The formula runs locally, so there is no account or waiting time.
Use the result
Treat the answer as a practical estimate for your next decision.