public Week(Date time){
  this(time,TimeZone.getDefault(),Locale.getDefault());
}

public Week ( Date time ) { this ( time , TimeZone . getDefault ( ) , Locale . getDefault ( ) ) ; }
creates a time period for the week in which the specified date / time falls , using the default time zone and locale ( the locale can affect the day - of - the - week that marks the beginning of the week , as well as the minimal number of days in the first week of the year ) .
