Business Days Calculator
Count Monday-to-Friday working days between dates, excluding the holidays you enter.
Result for the values shown.
Calculations run in your browser.
What to enter
| Input | Meaning and units |
|---|---|
| Start | Gregorian calendar date in YYYY-MM-DD format; years 0001 through 9999. |
| End | Gregorian calendar date in YYYY-MM-DD format; years 0001 through 9999. |
| Holiday dates (optional) | Gregorian calendar date in YYYY-MM-DD format; years 0001 through 9999. |
Understanding your result
Calendar results use the stated counting and anniversary convention. Complete months and years differ from fixed day counts.
Common mistakes
- Counting both end dates when the method excludes a boundary, or assuming all months have equal length.
Check your calculation
- Test a short known interval and a leap-day boundary; for working days, verify your holiday list.
Calculation checks, sources and review limits
How many Monday-to-Friday working days are between these dates?
Count Monday-to-Friday working days between dates, excluding the holidays you enter.
Common uses
- Count Monday-to-Friday working days between dates, excluding the holidays you enter.
How it works
Count dates d with start<=d<end, weekday Monday..Friday and d not in supplied holiday set. Calendar arithmetic uses the proleptic Gregorian calendar. Explicit calendar dates are independent of local daylight-saving changes. Month/year additions clamp to the last valid day of the destination month. Timestamp arithmetic requires a stated UTC offset and excludes leap seconds. Working days mean Monday through Friday. Enter holiday dates yourself; no country holiday calendar is assumed.
Worked example
Enter Start: 2024-01-01; End: 2024-01-08; Holiday dates (optional): 2024-01-01. The result is Business days: 4.
FAQ
How many Monday-to-Friday working days are between these dates?
Count dates d with start<=d<end, weekday Monday..Friday and d not in supplied holiday set. Calendar arithmetic uses the proleptic Gregorian calendar. Explicit calendar dates are independent of local daylight-saving changes. Month/year additions clamp to the last valid day of the destination month. Timestamp arithmetic requires a stated UTC offset and excludes leap seconds. Working days mean Monday through Friday. Enter holiday dates yourself; no country holiday calendar is assumed.
What assumptions and limits apply?
No automatic country holiday calendar. Start included and end excluded. Deduplicate holidays.