TIWCGJQDatePickerOptions.OnCalculateWeek Property
A function to calculate the week of the year for a given date. The default implementation uses the ISO 8601 definition: weeks start on a Monday; the first week of the year contains the first Thursday of the year.
published property OnCalculateWeek: TIWCGJSonFunc index 08 read GetFuncValue write SetFuncValue stored IsFuncStored;