Current ISO week number
The current ISO week is week — of —. ISO weeks run Monday through Sunday.
ISO week numbering
ISO weeks start on Monday. Week 1 is the week containing the year’s first Thursday. This system is widely used in European business calendars, but it is less common in countries where Sunday-based calendars dominate.
For country-specific planning, open the year calendar for the relevant country because weekends and public holidays are separate concepts from ISO week numbers.