diff --git a/src/pretix/presale/forms/renderers.py b/src/pretix/presale/forms/renderers.py
index 8106fc63bd..accc41cfb0 100644
--- a/src/pretix/presale/forms/renderers.py
+++ b/src/pretix/presale/forms/renderers.py
@@ -65,6 +65,8 @@ def render_label(content, label_for=None, label_class=None, label_title='', labe
     elif not optional:
         opt += '<i class="label-required">{}</i>'.format(pgettext('form', 'required'))
 
+    opt += '<strong class="label-alert" role="alert"></strong>'
+
     builder = '<{tag}{attrs}>{content}{opt}</{tag}>'
     return format_html(
         builder,
diff --git a/src/pretix/static/pretixpresale/js/ui/main.js b/src/pretix/static/pretixpresale/js/ui/main.js
index a79e017d07..3b5a72aec8 100644
--- a/src/pretix/static/pretixpresale/js/ui/main.js
+++ b/src/pretix/static/pretixpresale/js/ui/main.js
@@ -60,6 +60,7 @@ var form_handlers = function (el) {
             locale: $("body").attr("data-datetimelocale"),
             useCurrent: false,
             showClear: !$(this).prop("required"),
+            keepInvalid: true,
             icons: {
                 time: 'fa fa-clock-o',
                 date: 'fa fa-calendar',
@@ -82,8 +83,7 @@ var form_handlers = function (el) {
                     Math.abs(+new Date(opts.minDate) - new Date()) < Math.abs(+new Date(opts.maxDate) - new Date())
             ) ? opts.minDate : opts.maxDate;
         }
-        var alert = $('<span role="alert"></span>');
-        $("#"+this.getAttribute("aria-describedby")).prepend(alert);
+        var alert = $('label[for=' + this.id + '] .label-alert');
         $(this).datetimepicker(opts).on("dp.hide", function() {
             // when min/max is used in datetimepicker, closing and re-opening the picker opens at the wrong date
             // therefore keep the current viewDate and re-set it after datetimepicker is done hiding
@@ -93,14 +93,21 @@ var form_handlers = function (el) {
                 $dtp.viewDate(currentViewDate);
             }, 50);
         }).on('dp.error', function (e) {
-            console.log(this, e.date, e.oldDate, opts["minDate"], opts["maxDate"]);
-            alert.text("Mist, das ist ein Fehler! ");
-            // TODO: 
+            if (e.date) {
+                if (e.date.isBefore(opts["minDate"])) {
+                    alert.text(gettext("The date you entered is too early."));
+                } else if (e.date.isAfter(opts["maxDate"])) {
+                    alert.text(gettext("The date you entered is too late."));
+                }
+            } else {
+                alert.text(gettext("We could not recognize the date you entered."));
+            }
             var self = this;
             window.setTimeout(function () {
-                console.log(self);
-                //self.focus();
+                self.focus();
             }, 50);
+        }).on('dp.change', function (e) {
+            alert.text("");
         });
         
 
diff --git a/src/pretix/static/pretixpresale/scss/_forms.scss b/src/pretix/static/pretixpresale/scss/_forms.scss
index 62c397153f..95ca46ba76 100644
--- a/src/pretix/static/pretixpresale/scss/_forms.scss
+++ b/src/pretix/static/pretixpresale/scss/_forms.scss
@@ -145,15 +145,16 @@ output {
   color: $brand-primary;
   font-weight: bold;
 }
-.label-required {
-  color: $text-muted;
-  display: block;
+
+.label-required,
+.label-alert {
+  display: inline;
   font-weight: normal;
   font-style: normal;
   font-size: 85%;
+  color: $text-muted;
 }
-.checkbox .label-required {
-  display: inline;
+.label-required {
   &:before {
     content: " (";
   }
@@ -161,6 +162,22 @@ output {
     content: ")";
   }
 }
+.label-alert:not(:empty):before {
+  content: " – ";
+}
+@media (min-width: $screen-md-min) {
+  .form-group:not(:has(.checkbox)) {
+    .label-required,
+    .label-alert:not(:empty) {
+      display: block;
+    }
+    .label-required:before,
+    .label-required:after,
+    .label-alert:before {
+      content: "";
+    }
+  }
+}
 
 .form-control-text {
   padding-top: 7px;