diff --git a/src/xmpsidecar.cpp b/src/xmpsidecar.cpp
index 70f26019..1f88b8dd 100644
--- a/src/xmpsidecar.cpp
+++ b/src/xmpsidecar.cpp
@@ -144,11 +144,6 @@ namespace Exiv2 {
             copyExifToXmp(exifData_, xmpData_);
             copyIptcToXmp(iptcData_, xmpData_);
 
-            // #589 - restore tags which were modified by the convertors
-            for (auto&& it : copy) {
-                xmpData_[it.key()] = it.value();
-            }
-
             // #1112 - restore dates if they lost their TZ info
             for (auto&& date : dates_) {
                 std::string sKey = date.first;
@@ -163,6 +158,11 @@ namespace Exiv2 {
                 }
             }
 
+            // #589 - restore tags which were modified by the convertors
+            for (auto&& it : copy) {
+                xmpData_[it.key()] = it.value();
+            }
+
             if (XmpParser::encode(xmpPacket_, xmpData_,
                                   XmpParser::omitPacketWrapper|XmpParser::useCompactFormat) > 1) {
 #ifndef SUPPRESS_WARNINGS
diff --git a/test/data/issue_1998.xmp b/test/data/issue_1998.xmp
new file mode 100644
index 00000000..c1b84fa4
--- /dev/null
+++ b/test/data/issue_1998.xmp
@@ -0,0 +1,9 @@
+<?xpacket begin="" id="W5M0MpCehiHzreSzNTczkc9d"?>
+<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="XMP Core 4.4.0-Exiv2">
+ <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
+  <rdf:Description rdf:about=""
+    xmlns:xmp="http://ns.adobe.com/xap/1.0/"
+   xmp:CreateDate="2021-02-03T12:34:56+02:00"/>
+ </rdf:RDF>
+</x:xmpmeta>
+<?xpacket end="w"?>
\ No newline at end of file
diff --git a/tests/bugfixes/github/test_pr_1999.py b/tests/bugfixes/github/test_pr_1999.py
new file mode 100644
index 00000000..ef6e4b64
--- /dev/null
+++ b/tests/bugfixes/github/test_pr_1999.py
@@ -0,0 +1,28 @@
+# -*- coding: utf-8 -*-
+
+import system_tests
+from system_tests import CaseMeta, path
+
+class TestXmpDateTimeSetting(metaclass=CaseMeta):
+    """
+    Test fix for issue 1998.
+    """
+
+    infile = path("$data_path/issue_1998.xmp")
+    commands = [
+        "$exiv2 -M\"set Xmp.xmp.CreateDate XmpText 2021-02-03T12:00:00+01:00\" $infile",
+        "$exiv2 -K Xmp.xmp.CreateDate $infile",
+        "$exiv2 -M\"set Xmp.xmp.CreateDate XmpText 2021-02-03T12:34:56+02:00\" $infile",
+        "$exiv2 -K Xmp.xmp.CreateDate $infile",
+        ]
+    stdout = [
+        "",
+        """Xmp.xmp.CreateDate                           XmpText    25  2021-02-03T12:00:00+01:00
+""",
+        "",
+        """Xmp.xmp.CreateDate                           XmpText    25  2021-02-03T12:34:56+02:00
+""",
+              ]
+    stderr = [""]*4
+    retval = [0]*4
+