53-week years happen
ISO calendars occasionally pack in 53 numbered weeks (like 2020 and 2026), which can shift planning sprints by a whole week.
Calendar oddity
Workdays (Business Days) Calculator
1) Workdays Between Two Dates
Paste dates in YYYY-MM-DD format, one per line. Invalid lines are ignored.
2) Add / Subtract Workdays
About This Workdays Calculator
This tool helps you quickly count workdays (business days) between two dates and add or subtract a number of workdays from a base date. By default it counts Monday–Friday and skips weekends, with optional toggles for Saturday and Sunday if your workweek is different.
You can paste custom holiday dates to exclude them from the count or when stepping through days. Everything runs locally in your browser for speed and confidentiality—no uploads, no tracking.
Calculations use midnight UTC to avoid daylight-saving surprises. Results are shown in ISO format
(YYYY-MM-DD) for clarity and easy copying into spreadsheets or documents.
Tip: use the Set Today shortcut to prefill date fields with today’s UTC date.
Workdays Calculator: FAQs
How are workdays determined?
By default, workdays are Monday–Friday. You can choose to treat Saturday and/or Sunday as workdays with the toggles.
What about holidays?
Paste holiday dates (one per line) and they’ll be excluded when counting or adding workdays. No data leaves your device.
Is the counting inclusive?
You can choose Inclusive (count both start and end) or Exclusive (exclude start). For adding/subtracting, the base date isn’t counted unless you land on it.
Does it handle leap years?
Yes. All calculations are UTC-based and correctly handle leap years.
5 Fun Facts about Workdays
Friday–Saturday weekends exist
Not everyone stops on Saturday–Sunday: some regions take Friday–Saturday weekends, changing what “5 workdays” means.
Global schedules
4-day weeks are spreading
Pilot programs in the UK, Iceland, and New Zealand ran 4-day workweeks with no pay cuts—most participants kept or increased output.
Future of work
Holidays can erase a whole week
Stack a midweek holiday next to a weekend and a company shutdown, and you can drop below 60% of normal workdays for that week.
Planning pitfall
Markets love 252
U.S. stock exchanges average about 252 trading days a year—handy for quick returns math like CAGR and volatility.
Finance trivia