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Add 6 months from one date picker to another datepicker

I have two datepickers and one combobox in HTML. The combobox contain 2 values (6 months and 1 year). If I select 6 months from the combobox the second datepicker should show the date after 6 months from the first datepickers date.

I need code for this using JavaScript only not in jQuery.

My code is

      <option value="6">6 Months</option>
      <option value="12">1 Year</option>
    <input type="date" name="Sdate" id="Sdate">
    <input type="date" name="edate" id="edate">



I get the date from the start and add the number of months – then set the second datepicker using valueAsDate

I then add this function to both start date and month selector

Vanilla JavaScript

function setDate() {
  let d = new Date(document.getElementById("sDate").value)
  let mon = +document.getElementById("mon").value;
  document.getElementById("eDate").valueAsDate = d;

<select id="mon">
  <option value="6">6 Months</option>
  <option value="12">1 Year</option>
<input type="date" name="Sdate" id="sDate">
<input type="date" name="edate" id="eDate">
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