Date 如何在SharePoint列表中添加20天（不包括存储在React状态下的周末或假日）

我在开始日期的基础上增加了20天，不包括存储在state中的周末和假日。我想到了这个：

private _calculateExternalDeadLineDate = () => {
    console.log(this.state.ReceivedDate, 'state.Recieved date');
    var weekendDayCount = 0;
      var fromDate = this.state.ReceivedDate;
      var newFromDate = new Date(fromDate);     
      var toDateAdd20 = newFromDate.setDate(newFromDate.getDate()+20);
      var newToDate = new Date(toDateAdd20);
      
      while(newFromDate < newToDate){
        fromDate.setDate(fromDate.getDate() + 1);
        if(fromDate.getDay() === 0 || fromDate.getDay() === 6){
          ++weekendDayCount;
        }
      }
      
      var newToDateAddedWknds = newToDate.setDate(newToDate.getDate()+weekendDayCount);
      var ExternalDeadlineDate = new Date(newToDateAddedWknds);
//The below loop, loops through each day between start and end date. I'm wondering how I would count how many matches of dates between the contents of this loop and the stored array of dates?
    //@ts-ignore
      var start = new Date(fromDate);
      //@ts-ignore
      var end = new Date(newToDateAddedWknds);
      //@ts-ignore
      var loop = new Date(start);
      while(loop <= end){ //less than or equal to
             
         var newDate = loop.setDate(loop.getDate() + 1);
         loop = new Date(newDate);
         if(loop ===)
         console.log(loop,'loop');
      }

      if(ExternalDeadlineDate.getDay() === 0 || ExternalDeadlineDate.getDay() === 6){
        
        console.log(ExternalDeadlineDate.getDay(), 'getDay() is on a weekend');
      } else {
        console.log('getDay() is not on a weekend');
      }
     
  }

任何帮助都会很好

0: Item {Id: 1, Holiday: "2020-01-01T00:00:00Z"}
etc.