Business Days Calculator
Count business days between dates or add and subtract working days. Customize weekends, national holiday presets and your own holidays.
Count or add business days
Customize the workweek and exclude national or custom holidays.
A business-day calculator that does not assume every workweek is the same
Many calculators hard-code Saturday and Sunday as the weekend. DateTimeWise lets you choose any non-working weekdays, which is useful for different regional schedules and custom company workweeks. You can also exclude your own dates.
Holiday presets
The included presets are a convenience for common national or federal dates. They are intentionally conservative. Local observance rules can differ, so important filing, legal, payroll, shipping or compliance deadlines should be checked against the authoritative calendar for your location.
Invoice and deadline presets
The 15/30/60/90-day shortcuts make common planning tasks faster. For invoice terms, confirm whether the agreement means calendar days or business days before using the result.
Business day FAQ
Can Friday and Saturday be my weekend?
Yes. Toggle the weekday buttons to match your workweek.
Can I add company holidays?
Yes. Enter custom dates in YYYY-MM-DD format, one per line or separated by commas.
Are holiday presets legally authoritative?
No. They are planning aids. Verify important deadlines with the relevant official source.
Worked examples without holidays
| Inputs | Result |
|---|---|
| September 21–25, 2026; Saturday/Sunday weekend; include both dates | 5 business days |
| Same range; exclude both dates | 3 business days |
| Add 1 business day to Friday, September 25, 2026 | Monday, September 28, 2026 |
In add/subtract mode the starting date is not counted as the first business day. Adding zero returns the starting date, even if it is non-working. In between-dates mode, the endpoint switches control whether the entered dates are included.
Leave every weekday unchecked to use a seven-day working week. At least one weekday must remain working. To keep calculations responsive, offsets are limited to 10,000 business days and between-date ranges to 36,600 calendar days.
Choose “None” for holidays when reproducing these examples. For calendar days including weekends, use Days Between Dates. See calculation conventions before applying a result to a deadline.