[html] How to change the time format (12/24 hours) of an <input>?

Simple HTML trick to get this :

_x000D_
_x000D_
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet"/>_x000D_
<div class="row" >_x000D_
                       _x000D_
                        <div class="col-md-6">_x000D_
                             <div class="row">_x000D_
                                <div class="col-md-4" >_x000D_
                                       <label for="hours">Hours</label>_x000D_
          <select class="form-control" required>_x000D_
                <option>  </option>_x000D_
                <option value="1"> 1 </option>_x000D_
                <option value="2"> 2 </option>_x000D_
                <option value="3"> 3 </option>_x000D_
                <option value="4"> 4 </option>_x000D_
                <option value="5"> 5 </option>_x000D_
                <option value="6"> 6 </option>_x000D_
                <option value="7"> 7 </option>_x000D_
                <option value="8"> 8 </option>_x000D_
                <option value="9"> 9 </option>_x000D_
                <option value="10"> 10 </option>_x000D_
                <option value="11"> 11 </option>_x000D_
                <option value="12"> 12 </option>_x000D_
              </select>_x000D_
             </div>_x000D_
                <div class="col-md-4" >_x000D_
                      <label for="minutes">Minutes</label>_x000D_
              <select class="form-control" required="">_x000D_
                <option selected disabled>  </option>_x000D_
                <option value="00"> 00 </option>_x000D_
                <option value="10"> 10 </option>_x000D_
                <option value="20"> 20 </option>_x000D_
                <option value="30"> 30 </option>_x000D_
                <option value="40"> 40 </option>_x000D_
                <option value="50"> 50 </option>_x000D_
              </select>_x000D_
             </div>_x000D_
                 <div class="col-md-4" >_x000D_
                       <label for="hours">Select Meridiem</label>_x000D_
              <select class="form-control" required="" >_x000D_
                <option selected="" value="AM"> AM </option>_x000D_
                <option value="PM"> PM </option>_x000D_
              </select>_x000D_
              </div>_x000D_
             </div></div>_x000D_
                    </div>
_x000D_
_x000D_
_x000D_