Creates an instance of the definition.
@param firstDayOfWeek the first day of the week, not null @param minimalDaysInFirstWeek the minimal number of days _in the first week, from 1 to 7 @throws IllegalArgumentException if the minimal days value is invalid
See Implementation
Creates an instance of the definition.
@param firstDayOfWeek the first day of the week, not null @param minimalDaysInFirstWeek the minimal number of days _in the first week, from 1 to 7 @throws IllegalArgumentException if the minimal days value is invalid