<form name="auftragserfassung" action="verwaltung_auftrag_erfassen.php" method="post">

  <div class="row">     

    <div class="col-md-6">

​

​

      <div class="row">

        <div class="col-12">

          <div class="md-form">

            <input class="form-control" type="text" name="problemzeitraum" id="problemzeitraum" maxlength="50" required/>

            <label for="problemzeitraum">Problemzeitraum *</label>

          </div>

        </div>

      </div>

​

    </div>

  </div>

 </form>