getActualWeekOfYearMinimum()
Returns the minimum value of the Week of Year field
            for the time value of the Calendar.
Syntax
Numeric getActualWeekOfYearMinimum()
        Usage
This method
                considers the given time value and the current values of the
                    getFirstDayOfWeek(),
                    getMinimalDaysInFirstWeek(), and setTimeZone()
                methods. For example, if the Gregorian change date is January 10, 1970 and the date
                of this GregorianCalendar is January 20, 1970, the actual minimum
                value of the Day of Month field is 10 because the previous date of
                January 10, 1970 is December 27, 1996 (in the Julian calendar). Therefore, December
                28, 1969 to January 9, 1970 don't exist.