Week definition
The week definition is a regional setting that is set when preferences are defined. You can specify when week one begins for a year. If a year begins in the middle of a week, there can be some question as to when week one starts. Europe uses the ISO standard that says that a week starts on a Monday and the first week is the one containing January 4th. ANSI, which is used in the US, says that Sunday is the first day of the week.
You can specify both the methods of numbering weeks and the day the week begins. The specified week definitions are reflected in the planning board. The number of the week is displayed. In addition, the first day of the new week is separated from the previous week with a line in the time axis at the top of the planning board.