From e5508e764b946f12f1d0ee82958362a33f141270 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Stefan=20H=C3=A4rter?= <sha@rother-oss.com>
Date: Wed, 19 Jun 2024 08:28:12 +0200
Subject: [PATCH] Issue #3483: Allow date time fields to be reset if empty.

---
 Kernel/System/DynamicField/Driver/Lens.pm  | 3 ++-
 var/httpd/htdocs/js/Core.UI.InputFields.js | 8 +++++++-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/Kernel/System/DynamicField/Driver/Lens.pm b/Kernel/System/DynamicField/Driver/Lens.pm
index 341eddc1dd..3b65775882 100644
--- a/Kernel/System/DynamicField/Driver/Lens.pm
+++ b/Kernel/System/DynamicField/Driver/Lens.pm
@@ -713,7 +713,8 @@ sub GetFieldState {
 
     # set the new value if it differs
     if (
-        $Self->ValueIsDifferent(
+        !defined $DFParam->{"DynamicField_$DynamicFieldConfig->{Name}"}
+        || $Self->ValueIsDifferent(
             DynamicFieldConfig => $DynamicFieldConfig,
             Value1             => $DFParam->{"DynamicField_$DynamicFieldConfig->{Name}"},
             Value2             => $AttributeFieldValue,
diff --git a/var/httpd/htdocs/js/Core.UI.InputFields.js b/var/httpd/htdocs/js/Core.UI.InputFields.js
index 551c7297c3..d2a61f939e 100644
--- a/var/httpd/htdocs/js/Core.UI.InputFields.js
+++ b/var/httpd/htdocs/js/Core.UI.InputFields.js
@@ -3140,7 +3140,13 @@ Core.UI.InputFields = (function (TargetNS) {
      *      This function sets a given date for a given date selection
      */
     TargetNS.SetDate = function ($Parent, DateString) {
-        var DateObj = new Date(DateString);
+        var DateObj;
+        if (DateString) {
+            DateObj = new Date(DateString);
+        }
+        else {
+            DateObj = new Date();
+        }
 
         // set used checkbox
         $Parent.find('input[type=checkbox][id$=Used]').attr('checked', DateString ? true : false);