How many weekdays until [event]?
When planning around a deadline, you often need to know "how many weekdays until X?" — counting only Monday through Friday. Add holiday-aware counting and you've got "business days until X." Here's how to calculate it.
For exact business-day counts to or from any date, the business days calculator handles it.
The basic concept
Weekdays until X: count Monday-Friday days between today and X.
Calendar days until X: count all days, including weekends.
For a typical month, weekdays are about 5/7 of calendar days. Plus or minus depending on which days of the week the period starts and ends on.
Quick math
If today is Wednesday May 21, 2026, and your event is Friday June 12, 2026:
- Calendar days: 22 days (May 21 to June 12)
- Of those: 4 weekends (4 Saturdays, 4 Sundays) = 8 weekend days
- Weekdays: 22 - 8 = 14 weekdays
Or if you start counting from "tomorrow":
- Calendar days: 22 days starting May 22
- Weekends in range: 3 (May 23-24, May 30-31, June 6-7)
- Weekdays: 22 - 6 = 16 weekdays
- Plus the half-day from May 22 (Friday) to be inclusive
The exact count depends on inclusive vs exclusive endpoints. Specify which.
Including or excluding the start/end
A common ambiguity:
"5 weekdays until Friday May 30": from today (Friday May 23) to Friday May 30. Days in between: Mon May 26, Tue May 27, Wed May 28, Thu May 29 = 4 weekdays. Plus Friday May 30 (target). Plus possibly today (Friday May 23). So 4, 5, or 6 depending on rule.
For business contracts and legal terms, be explicit:
- "5 business days from today" = 5 weekdays starting tomorrow, or 5 weekdays starting today inclusive
- "5 business days before deadline" = unambiguous: 5 weekdays before
- "5 weekday days from now" = ambiguous
The business days calculator handles both inclusive and exclusive interpretations.
With holidays excluded
Going from "weekdays only" to "business days" adds holidays:
Business days = weekdays minus public holidays
For US, that's 11 federal holidays per year. So if a 30-day calendar period contains 1 federal holiday plus 8 weekend days:
- Calendar days: 30
- Weekend days: 8
- Holidays: 1
- Business days: 30 - 8 - 1 = 21
The business days calculator accounts for country-specific holidays.
Different country holidays
Different countries have different public holidays:
| Country | Approximate annual holidays |
|---------|------------------------------|
| US | 11 federal |
| UK | 8 bank holidays |
| Germany | 9-13 (state-dependent) |
| Japan | 16 |
| France | 11 |
| China | 7 official |
| India | 3 national + state holidays |
For international deadlines, account for the relevant country's holidays.
Common calculation scenarios
Project deadlines
"Project due in 30 business days":
- Add 30 weekdays from today, accounting for holidays
- The business days calculator handles this
Service-level agreements
"Response within 2 business days":
- Customer files ticket Friday afternoon
- Day 1: Monday
- Day 2: Tuesday
- Response due: Tuesday end of day
Document delivery
"Mail will arrive in 5-7 business days":
- Send Friday
- Day 1: Monday (skipping weekend)
- Day 5: following Friday
- Day 7: following Tuesday
Tax filing
"Quarterly estimated tax due 15 days after quarter end":
- Q3 ends September 30
- 15 calendar days = October 15
- 15 business days = October 21 (depending on weekends/holidays)
The IRS uses calendar days. Other deadlines may use business days. Read the rules carefully.
Calculating manually
Steps for "X business days from today":
1. Add X to today's date (calendar days)
2. Count weekends in the range
3. Count holidays in the range (if business days, not weekday)
4. Subtract weekends and holidays from calendar days
5. If the count is less than X, advance the end date by 1 day (skipping weekends/holidays)
6. Repeat until count = X
For "X weekday days from today":
1. Add X to today's date
2. Adjust if you land on a weekend (jump to next Monday)
3. Count again, adjust further if needed
This is tedious. Use a calculator.
Specific tools
Web-based:
- The business days calculator — handles holidays for major countries
- timeanddate.com weekday calculator
- workingdays.us — focused on US
Spreadsheet:
- Excel: `=NETWORKDAYS(start, end, holidays)` excludes weekends and optional holidays
- Google Sheets: same formula
- LibreOffice Calc: same
Programming:
- Python: `python-businessday` or `workalendar` libraries
- JavaScript: `workdays` package
- Ruby: `business_time` gem
Special cases
Half days
Some deadlines split the day:
- "Before noon Friday" = morning half-day
- "End of business Friday" = end of work day, ~5 PM
For these, you typically count weekdays as integer days but handle the time component separately.
Multiple time zones
For deadlines crossing zones:
- A "5 business days from today" deadline depends on which country's calendar
- Specify: "5 US business days" or "5 UK business days"
- Cross-country deadlines must specify
Leap-second adjustments
Don't worry about them. Business day counting works at calendar-day precision; leap seconds are sub-second adjustments.
DST shifts
Don't affect business day counting. The clock changes by an hour but the calendar day is the same.
When to use weekdays vs business days
Use weekdays (Mon-Fri only): when holidays don't matter or aren't relevant. Useful for simple counting.
Use business days (weekdays minus holidays): when actual business operations matter. Most contracts, financial deadlines, government processes.
Use calendar days (Mon-Sun): when all days count equally. Rare in modern business contexts.
FAQ
Is "X business days" the same as "X working days"?
Usually yes. Different terms; same concept. Both mean weekdays excluding holidays.
Does counting include the start day?
Depends on context. Be specific. "5 business days starting today" = today is day 1; "5 business days from today" usually means tomorrow is day 1.
What if my deadline lands on a weekend?
Most legal/business systems extend to next business day. So if "30 business days from today" lands on Saturday, the deadline becomes the following Monday.
How do I count when crossing year boundaries?
Same logic — count weekdays through the year change, including holiday-aware weekends and holidays. The business days calculator handles it.
What about religious holidays?
Some workplaces observe additional religious holidays. For business day counting, only public holidays affect the count. Religious holidays are personal time.
Will my deadline shift if a country adds a new holiday?
Yes. New holidays (like Juneteenth in the US 2021) shift the count. Calculations from before the change might be slightly off.
Bottom line
Counting weekdays until an event excludes Saturdays and Sundays. Counting business days excludes weekends and public holidays. Use the business days calculator for accurate counts that account for country-specific holidays.