how to get the First date and Last date of the given month ?

Question

I have used dropdownlist for the month and i want to get the first and last date of the month selected in dropdown.

 

<select  id="Month">

<option value="1" >Jan</option>

<option value="2">Feb</option>

<option value="3" >Mar</option>

<option value="4">Apr</option>

<option value="5">May</option>

<option value="6">Jun</option>

<option value="7">Jul</option>

<option value="8">Aug</option>

<option value="9">Sept</option>

<option value="10">Oct</option>

<option value="11" >Nov</option>

<option value="12">Dec</option>

</select>

 

if i have selected nov so result i want is 1-11-2018 the first date and 30-11-2018 as last date.