TimeDateLabTime & Date Calculators简体中文

Private, deterministic calculation

Day Counter

Count the days between two dates, with a clear breakdown of weekdays and weekend days. The active endpoint rule stays visible in the result.

Enter dates and calculate

Your inputs stay in this browser. A result appears only after Calculate, unless you open a valid shared calculation.

Input

Start date

End date

Excluded

The start date is counted. The end date is not counted.

Result

Your day count will appear here.

Choose a start and end date, then calculate the difference.

LocalCalculated in your browser
ModelCivil calendar days
Weekday ruleMon–Fri weekdays · Sat–Sun weekend

How the Day Counter works

Each Civil Date becomes an integer day index in the proleptic Gregorian calendar. The ordered difference gives a Calendar-day Interval. Full seven-day blocks contribute five Weekdays and two Weekend Days; at most six remaining dates are classified individually.

Examples you can reproduce

  • Adjacent dates count as 1 day when the end is excluded, or 2 when it is included.
  • Equal dates count as 0 by default, or 1 with Included End Date.
  • 1900 is not a leap year; 2000 is a leap year under the 4/100/400 rule.
  • Every complete seven-day interval contains exactly 5 Weekdays and 2 Weekend Days.

Limits and assumptions

Weekday means Monday through Friday. Weekend Day means Saturday or Sunday. Holidays and regional work calendars are intentionally not included.

Frequently asked questions

Is the end date included?

Not by default. Turn on Included End Date to count both endpoints. The result repeats the active rule.

Are weekends included?

Yes. Total calendar days include every date; Weekdays and Weekend Days are shown separately.

Does it use 24-hour timestamp differences?

No. It compares Civil Dates directly, so timezone and daylight-saving changes cannot alter the count.