//Calendar 객체
    function Calendar(newDate){
      if(newDate == null){
        this.date = new Date();
      }
      this.date = newDate;
      this.set = function(newDate) {
        this.date = newDate;
      };
      this.get = function() {
        return this.date;
      };
      this.getLongTime = function() {
        return this.date.getTime();
      };
      this.setLongTime = function(millisec) {
        return this.date.setTime(millisec);
      };
      this.setTxtTime = function(time_txt){
        var time = time_txt.split(":");
        this.date.setHours(time[0]);
        this.date.setMinutes(time[1]);
        this.date.setSeconds(time[2]);
      }
      this.getTxtTime = function(){
        return this.date.setHours() + ":" + this.date.setMinutes() +":" +this.date.setSeconds();
      }
      this.addDay = function( day ) {
        this.setLongTime(this.getLongTime() + day * 86400000);
      }
      this.getYear = function() {
        return this.date.getFullYear();
      };
      this.setYear = function(year) {
        this.date.setFullYear(year);
      };

      this.getMonth = function() {
        return this.date.getMonth()+1;
      };
      this.setMonth = function(month) {
        this.date.setMonth(month-1);
      };
      this.getDayOfMonth = function() {
        return this.date.getDate();
      };
      this.setDayOfMonth = function(dayOfMonth) {
        this.date.setDate(dayOfMonth);
      };

      this.setDayOfWeek = function(dayOfWeek) {
        var day = dayOfWeek - this.date.getDay();
        this.addDay(day);
      };
      this.getDayOfWeek = function() {
        return this.date.getDay();
      };

      this.getLastDay = function(){
        return new Date(this.date.getFullYear(), (this.date.getMonth())+1, 0);
      }
      this.getStartDay = function(){
        return new Date(this.date.getFullYear(), this.date.getMonth(), 1);
      }
      this.setDate = function( year, month, dayOfMonth ) {
        this.setYear(year);
        this.setMonth(month);
        this.setDayOfMonth(dayOfMonth);
      };

      this.getyyyyMMdd = function() { return this.getYear() + "-" + filling(this.getMonth(), 2) + "-" + filling(this.getDayOfMonth(), 2); };

      var filling = function(value, length) {
        var result = "" + value;
        for( var step = result.length; step < length; step++ ) {
          result = "0" + result;
        }
        return result;
      }
    }