diff --git a/EnvelopeGenerator.Web/Views/Home/ShowEnvelope.cshtml b/EnvelopeGenerator.Web/Views/Home/ShowEnvelope.cshtml
index 5562c543..3ce06ffc 100644
--- a/EnvelopeGenerator.Web/Views/Home/ShowEnvelope.cshtml
+++ b/EnvelopeGenerator.Web/Views/Home/ShowEnvelope.cshtml
@@ -130,7 +130,7 @@
                     </div>
                     <div class="input-group">
                         <span class="input-group-text">Gültig bis</span>
-                        <input type="date" name="expiration" class="form-control" id="readonly-date-valid"
+                        <input type="date" name="expiration" class="form-control" lang="de" id="readonly-date-valid" onkeydown="return false;" onclick="this.showPicker()"
                         min="@DateTime.Today.AddDays(1).ToString("yyyy-MM-dd")"
                         max="@DateTime.Today.AddDays(90).ToString("yyyy-MM-dd")"
                         value="@DateTime.Today.AddDays(7).ToString("yyyy-MM-dd")">