Working Days Calculator

Direct answer

Count each date from the start date up to, but not including, the end date. This calculator counts Monday through Friday as working days and Saturday and Sunday as weekend days. ISO 8601 provides an unambiguous Gregorian date format, which this calculator uses for every input.

Variables and formula

• Start date: the first date in the interval; it is included.
• End date: the first date after the interval; it is excluded.

Working days = complete weeks × 5 + weekdays in the remaining days

Reproducible example

From Monday, 2026-08-24 to Monday, 2026-08-31, there are five Monday-to-Friday working days, two weekend days and seven calendar days.

Interpretation

The result is a transparent weekday count, useful for planning a simple internal schedule. It does not tell you whether a particular workplace is open or whether a date is a legal deadline.

Assumptions and limitations

• A working week is Monday through Friday.
• The start date is included; the end date is excluded.
• Public holidays, regional weekends, shift schedules and legal counting rules are excluded.

Common mistakes

• Assuming the end date is counted automatically.
• Treating every Monday-to-Friday day as a public-business day.
• Using the result for a contract, filing or notice deadline without checking the governing rule.

Assumptions

• Working days are Monday through Friday only.
• The start date is included and the end date is excluded.
• Public holidays, local workweek rules, shift patterns and legal deadline rules are excluded.

Sources and methodology

CalcMotive publishes the formula and assumptions so you can decide whether the estimate fits your use case. See our methodology standards.

• ISO 8601 Date and Time Format; International Organization for Standardization; accessed Aug 24, 2026