diff --git a/samples/templates/excel2003.xml b/samples/templates/excel2003.xml
index cd1188a7..5e0268f9 100644
--- a/samples/templates/excel2003.xml
+++ b/samples/templates/excel2003.xml
@@ -14,7 +14,7 @@
   <Description>Some comments about the PHPExcel Gnumeric Reader</Description>
   <LastAuthor>Owen Leibman</LastAuthor>
   <Created>2010-09-02T20:48:39Z</Created>
-  <LastSaved>2010-09-02T20:48:39Z</LastSaved>
+  <LastSaved>2010-09-03T21:48:39Z</LastSaved>
   <Category>PHPExcel Xml Reader Test Category</Category>
   <Manager>Maarten Balliauw</Manager>
   <Company>PHPExcel</Company>
diff --git a/src/PhpSpreadsheet/Reader/Xml/Properties.php b/src/PhpSpreadsheet/Reader/Xml/Properties.php
index fa0d7957..1c3e421a 100644
--- a/src/PhpSpreadsheet/Reader/Xml/Properties.php
+++ b/src/PhpSpreadsheet/Reader/Xml/Properties.php
@@ -70,7 +70,7 @@ class Properties
 
                 break;
             case 'Created':
-                $docProps->setCreated($this->processTimestampValue($stringValue));
+                $docProps->setCreated($stringValue);
 
                 break;
             case 'LastAuthor':
@@ -78,7 +78,7 @@ class Properties
 
                 break;
             case 'LastSaved':
-                $docProps->setModified($this->processTimestampValue($stringValue));
+                $docProps->setModified($stringValue);
 
                 break;
             case 'Company':
@@ -135,7 +135,7 @@ class Properties
                 break;
             case 'dateTime.tz':
                 $propertyType = DocumentProperties::PROPERTY_TYPE_DATE;
-                $propertyValue = $this->processTimestampValue(trim((string) $propertyValue));
+                $propertyValue = trim((string) $propertyValue);
 
                 break;
         }
@@ -154,11 +154,4 @@ class Properties
             ? new SimpleXMLElement('<xml></xml>')
             : ($simple->attributes($node) ?? new SimpleXMLElement('<xml></xml>'));
     }
-
-    protected function processTimestampValue(string $dateTimeValue): int
-    {
-        $dateTime = strtotime($dateTimeValue);
-
-        return $dateTime === false ? time() : $dateTime;
-    }
 }
diff --git a/tests/PhpSpreadsheetTests/Reader/Xml/XmlLoadTest.php b/tests/PhpSpreadsheetTests/Reader/Xml/XmlLoadTest.php
index 3783c1a9..29d81299 100644
--- a/tests/PhpSpreadsheetTests/Reader/Xml/XmlLoadTest.php
+++ b/tests/PhpSpreadsheetTests/Reader/Xml/XmlLoadTest.php
@@ -2,7 +2,9 @@
 
 namespace PhpOffice\PhpSpreadsheetTests\Reader\Xml;
 
+use DateTimeZone;
 use PhpOffice\PhpSpreadsheet\Reader\Xml;
+use PhpOffice\PhpSpreadsheet\Shared\Date;
 use PHPUnit\Framework\TestCase;
 
 class XmlLoadTest extends TestCase
@@ -21,8 +23,17 @@ class XmlLoadTest extends TestCase
         self::assertEquals('BCD', $sheet->getCell('A4')->getValue());
         $props = $spreadsheet->getProperties();
         self::assertEquals('Mark Baker', $props->getCreator());
+        $creationDate = $props->getCreated();
+        $result = Date::formattedDateTimeFromTimestamp("$creationDate", 'Y-m-d\\TH:i:s\\Z', new DateTimeZone('UTC'));
+        self::assertEquals('2010-09-02T20:48:39Z', $result);
+        $creationDate = $props->getModified();
+        $result = Date::formattedDateTimeFromTimestamp("$creationDate", 'Y-m-d\\TH:i:s\\Z', new DateTimeZone('UTC'));
+        self::assertEquals('2010-09-03T21:48:39Z', $result);
         self::assertEquals('AbCd1234', $props->getCustomPropertyValue('my_API_Token'));
         self::assertEquals('2', $props->getCustomPropertyValue('myאInt'));
+        $creationDate = $props->getCustomPropertyValue('my_API_Token_Expiry');
+        $result = Date::formattedDateTimeFromTimestamp("$creationDate", 'Y-m-d\\TH:i:s\\Z', new DateTimeZone('UTC'));
+        self::assertEquals('2019-01-31T07:00:00Z', $result);
 
         $sheet = $spreadsheet->getSheet(0);
         self::assertEquals('Sample Data', $sheet->getTitle());