Business Days Between Dates

Pick a start date and an end date, choose a workweek, and the calculator returns the number of business days between them along with total days and weekend days. Toggle "Include end date" when the closing date counts toward the span, for example a billing window or a notice period that ends on its last day. Optionally pick a country to subtract that calendar's public holidays in addition to weekends. The result is calendar math, not clock math, so a one-day window returns one or zero business days depending on the weekday and the holiday flag, never a fraction. To land on the Nth working day forward from a start, use the add business days calculator instead.

Common use cases

• Quoting a project lead time. A client signs on Monday 2026-04-27 and asks when the deliverable lands "in 10 working days." Set start to today, end to 2026-05-08, include the end date, and confirm the count is 10. Quote that Friday in the statement of work so the contract and the calendar agree.
• Estimating payroll periods. A semi-monthly payroll cycle pays for the working days inside each half-month. Enter the cycle start and cycle end, pick the country to remove public holidays, and read the business-day count straight off the result. The figure feeds straight into the hours-per-period field on the timesheet.
• Sizing a vacation request. A two-week trip from 2026-07-13 through 2026-07-26 looks like 14 days off. The calculator shows it costs only 10 business days against the leave balance, because both weekends inside the span are unpaid days the employer never owed.
• Checking a regulatory response window. A regulator gives 15 business days to file a response. Set the receipt date as start, iterate end dates until the count reaches 15, and confirm the Friday that lands. Reverse the inputs to read a negative count when the receipt date trails the deadline.
• Sanity-checking a contract clock. When a contract reads "within 30 days" without specifying calendar or business days, run both. The total-days row covers the calendar reading; the business-days row covers the working-day reading. The gap between the two is the negotiation room.

How it works

The calculator parses both dates as plain YYYY-MM-DD values, walks one day at a time from the earlier date to the later date, and counts each day that falls on a workday in the chosen workweek. The default workweek is Monday through Friday, and the count drops by one for each public holiday you opt into through the country picker. Saturdays, Sundays, and excluded holidays show up in the weekend-days and total-days rows so you can audit the math.

1. Enter the start and end dates. Pick both dates in YYYY-MM-DD form. Either date can come first; the calculator handles reversed inputs by returning a negative count.
2. Decide whether the end date counts. Leave "Include end date" off when the end is the morning the clock stops, like a deadline. Switch it on when the end date itself is a working day inside the span, like the last day of a billing period.
3. Pick a workweek. Keep Monday through Friday for most jurisdictions. Switch to Sunday through Thursday for Saudi Arabia, Egypt, or other regions with a Friday weekend, or set a custom pattern for shift work.
4. Choose a country for holidays. Selecting a country pulls that calendar from the date-holidays dataset and subtracts each public holiday that falls on a workday. Leave it blank to count weekends only.
5. Read all three rows. Total days is the calendar span; business days is what survives after weekends and holidays; weekend days is the difference. Reconcile the three before pasting any of them into a contract.

Worked examples

Edge cases & gotchas

• The "include end date" toggle shifts the count by one. Turn the toggle off and the end date drops out of the walk; turn it on and it counts. For 2026-04-27 to 2026-05-08, the count is 10 with the toggle on and 9 with it off. Match the toggle to the contract: invoice periods usually include the closing date, while deadlines usually do not.
• Reversed inputs return a negative count. Entering 2026-05-08 as start and 2026-04-27 as end returns -10 business days, not zero and not an error. The sign signals direction, which is useful for an invoice that bills backward from a closing date. Swap the inputs to read a positive count.
• Holidays that land on a weekend. When a public holiday falls on a Saturday or Sunday, the date-holidays dataset still lists the actual date. Because the calculator subtracts holidays only when they land on a workday, a Saturday holiday already sits in the weekend-days row and does not change the business-day total. Many calendars then observe the holiday on the adjacent Friday or Monday; the dataset records that observed date separately when applicable.
• Same start and end date. With the toggle on and a weekday date, a one-day span returns 1 business day. With the toggle off it returns 0, because the only date in the span is the boundary that the toggle skips. A weekend date returns 0 either way.

Frequently asked questions about Business Days Between Dates

Glossary

Business day

A day inside the span that lands on a configured workday and is not in the chosen public-holiday list. Default workweek is Monday through Friday.

Workweek

The set of weekdays that count as working. Monday-Friday in most of the world, Sunday-Thursday in some Middle East regions, configurable here.

Public holiday

A nationally observed non-working day. The calculator uses the "public" tier of the date-holidays dataset; bank holidays and observances are not subtracted.

Include end date

A toggle that decides whether the end boundary counts in the walk. Off skips the boundary; on counts it.

Total days

The raw calendar-day count for the span, used as a cross-check. Equals business days plus weekend days plus excluded holidays.