Code Sample - Date Range validator

DateRangeValidator.ts

   /* Component date range validator used abroad date applications     
      
      Receives a JSON Object dateControlValue with a dateFrom and dateTo,
      Validates that one is greater dateTo is greater than dateFrom, if that happens then validateDateLimit triggers 
      an error message. If null is returned this means the validator won't display any message.
      
      Original implementation by me.
   */
    validate(control: AbstractControl): { [key: string]: any } {
        let dateControlValue = control.value;
        if (dateControlValue && dateControlValue.dateFrom && dateControlValue.dateTo){
            let dateFrom = this.parseDate(dateControlValue.dateFrom);
            let dateTo = this.parseDate(dateControlValue.dateTo);
            if(dateFrom > dateTo || isNaN(dateFrom.getTime()) || isNaN(dateTo.getTime()) ) return {
                validateDateLimit: false
            }
        }
        return null;
    }

    parseDate(controlDate: any) : Date{
        return typeof controlDate === 'string' ? this.dateService.string2Date(controlDate, this.dateFormat) : controlDate;
    }