Dynamically change start and end date for date range datepicker

[geethzz]

I am setting a date range picker with start date and end date as start date + n number of days. After some condition checking, I need to change these dates to some other date. How can I change these dynamically from my component.ts file.

`

onRangeDateSelection(event: IMyRangeDateSelection): void {

   let { isBegin, date, jsDate } = event;
   let options: IAngularMyDpOptions = this.getCopyOfOptions();
   if (isBegin) {
       this.ngxdp.writeValue({
          isRange: true,
          singleDate: null,
          dateRange: {
              beginDate: { year: 0, month: 0, day: 0 },
              endDate: { year: 0, month: 0, day: 0 }
          }
      });
      this.ngxdp.setHostValue('');
      this.getRangeDates(jsDate, this.freeSlotRange);

   }
   else {
     this.setEndDate('');
   }

 }

  getRangeDates(dateFrom, freeSlotRange) {

      let options: IAngularMyDpOptions = this.getCopyOfOptions();

      let d = new Date(new Date(dateFrom).getTime());
      let freeSlots = parseInt(freeSlotRange);
     d.setDate(d.getDate() + freeSlots - 1);
     let loop = new Date(dateFrom);
     loop.setDate(loop.getDate() - 1);

     let markedDates = [];
     var markedDate = {};
     markedDate['dates'] = [];

    while (loop < d) {

         let newDate = loop.setDate(loop.getDate() + 1);

        let day = new Date(newDate).getDate();
        let month = new Date(newDate).getMonth();
        let year = new Date(newDate).getFullYear();
        markedDate['dates'].push({ day: day, month: month + 1, year: year });
        loop = new Date(newDate);
     }
     markedDate['styleClass'] = 'freeSlots';

     markedDates.push(markedDate);
     options.markDates = markedDates;
     this.setDatePickerOptions(options);

  }

   setEndDate() {
      let options: IAngularMyDpOptions = this.getCopyOfOptions();
      options.disableSince = { year: 0, month: 0, day: 0 };
      this.setDatePickerOptions(options);

      let d: Date = new Date();
      let month: any = d.getMonth() + 1;
      if (month < 10) {
          month = '0' + month;
      }
  }

`

I need to change these start and end dates form another function.