How working days are counted
What's the difference between working days and calendar days, and how do public holidays and make-up days factor in? This page lays out the rules for counting working days — useful for paydays, delivery dates, and legal deadlines.
Working days vs calendar days
Calendar days count every single day; working days count only "the days you work" — that is, what's left after removing weekends (and holidays). Over the same period, the two counts can differ a lot, which is exactly why you can't schedule a timeline using calendar days alone.
| Period | Calendar days | Working days (weekends excluded) |
|---|---|---|
| Mon → Fri of the same week | 5 days | 5 |
| Mon → Mon of the next week | 8 days | 6 |
| Two full weeks (14 days) | 14 days | 10 |
Public holidays and make-up days
Beyond weekends, a calendar also has public holidays (days off that aren't weekends) and make-up workdays (weekend days that are worked). The strictest working-day count factors in both: holidays are removed from working days, and make-up days are added back. The date calculator's workdays mode is based on excluding weekends; for periods that contain public holidays, remember to adjust against that year's calendar yourself.
Common uses
- Payday: when it falls on a holiday and shifts earlier or later, you need to count working days forward or back.
- Delivery dates: a supplier quotes "X working days", which you convert into an actual date on the calendar.
- Legal deadlines: many deadlines are counted in working days, where being off by a day can mean missing it.
Notes for cross-country situations
Different countries define weekends and holiday tables differently (in some regions, Friday and Saturday are the weekend). When working across borders, agree first on whose calendar "working days" follow, then come back to the Date Calculator and estimate with workdays mode.