bug in func2

in **func2** in your **service** you are not return any thing in the **last else** 

    else {
      var day2 = this.day + 10;
      this.month = (day2 / 30) + 10;
      this.day = (day2 % 30);
      if (day2 % 30 == 0) {
        this.month--;
        this.day = 30;
      }
      this.year = this.gregorianYear - 622;
    }

and in _typescript_ version **5.2.2** its have error