Business Day Calculator

Only used when counting working days between two dates.
Negative counts backwards. Only used in the add/subtract mode.
Rule 6(a)(5): a backward period is counted backward, and a weekend or holiday moves the deadline earlier, not later.
Your own non-working days as YYYY-MM-DD, separated by commas. Added to whichever calendar is selected.
Working days
21 days
Business Day Calculator
Calendar days
31 days
Weekend days in the span
8 days
Holidays excluded
2 days
Result date
2024-01-31
Result date falls on
Wednesday
Date before any roll-forward
2024-01-31
Days rolled forward
0 days
Start date falls on
Monday
Working days per week
5 days
Counted
forward from the event
Summary
21 working day(s) from 2024-01-01 to 2024-01-31 inclusive (31 calendar day(s), 8 weekend day(s), 2 holiday(s) removed).
Worked out from Microsoft Excel NETWORKDAYS.INTL function specification and 4 other sources.
Holiday calendars differ by employer, court and country. Confirm the applicable holiday list and, for a legal deadline, the governing rule before relying on this date.

How this is worked out

5 steps
  1. Weekend: Saturday and Sunday (5 working day(s) a week).
  2. Holiday calendar: US federal holidays (5 U.S.C. 6103).
  3. 2024-01-01 to 2024-01-31 inclusive is 31 calendar day(s).
  4. Remove 8 weekend day(s): 31 - 8 = 23 weekday(s).
  5. Remove 2 holiday(s) that fall on a working weekday: 23 - 2 = 21.
Holidays in the spantable
2024-01-01 New Year's Day, 2024-01-15 Birthday of Martin Luther King, Jr.

Results are general information, not financial, tax, legal, medical or engineering advice.