class MyDate{
  constructor(dateStr) {
    var arr = dateStr.split(' ');
    var dateArr = arr[0].split('-');
    this.year = parseInt(dateArr[0]);
    this.month = parseInt(dateArr[1]); 
    this.day = parseInt(dateArr[2]);
    if(arr.length>1){
      var tarr = arr[1].split(':');
      this.hour = parseInt(tarr[0]);
      this.minute = parseInt(tarr[1]);
      this.sec = 0;
      if(tarr.length>2){
        this.sec = parseInt(tarr[2]);
      }    
    }
  }
  getDateTime=function() {
    return new Date(this.year,this.month-1,this.day,this.hour,this.minute,this.sec);
  }
  getDate=function() {
    return new Date(this.year,this.month-1,this.day);
  }
  getDateNumber=function() {
    return Date.parse(this.getDate());
  }  
}

//....
  getDateTime() {
    return new Date(this.year,this.month-1,this.day,this.hour,this.minute,this.sec);
  }
  getDate() {
    return new Date(this.year,this.month-1,this.day);
  }
  getDateNumber() {
    return Date.parse(this.getDate());
  }  
//....