diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index ffe8fdf512..ced31605c8 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -2875,16 +2875,6 @@ parameters:
 			count: 1
 			path: src/PhpSpreadsheet/Reader/Gnumeric.php
 
-		-
-			message: "#^Parameter \\#1 \\$timestamp of method PhpOffice\\\\PhpSpreadsheet\\\\Document\\\\Properties\\:\\:setCreated\\(\\) expects int\\|string\\|null, int\\|false given\\.$#"
-			count: 2
-			path: src/PhpSpreadsheet/Reader/Gnumeric.php
-
-		-
-			message: "#^Parameter \\#1 \\$timestamp of method PhpOffice\\\\PhpSpreadsheet\\\\Document\\\\Properties\\:\\:setModified\\(\\) expects int\\|string\\|null, int\\|false given\\.$#"
-			count: 2
-			path: src/PhpSpreadsheet/Reader/Gnumeric.php
-
 		-
 			message: "#^Offset 'No' does not exist on SimpleXMLElement\\|null\\.$#"
 			count: 2
diff --git a/src/PhpSpreadsheet/Reader/Gnumeric.php b/src/PhpSpreadsheet/Reader/Gnumeric.php
index dfba56d761..d3cdf1b002 100644
--- a/src/PhpSpreadsheet/Reader/Gnumeric.php
+++ b/src/PhpSpreadsheet/Reader/Gnumeric.php
@@ -6,6 +6,7 @@
 use PhpOffice\PhpSpreadsheet\Cell\DataType;
 use PhpOffice\PhpSpreadsheet\DefinedName;
 use PhpOffice\PhpSpreadsheet\Reader\Gnumeric\PageSetup;
+use PhpOffice\PhpSpreadsheet\Reader\Gnumeric\Properties;
 use PhpOffice\PhpSpreadsheet\Reader\Security\XmlScanner;
 use PhpOffice\PhpSpreadsheet\ReferenceHelper;
 use PhpOffice\PhpSpreadsheet\RichText\RichText;
@@ -262,148 +263,6 @@ public static function gnumericMappings(): array
         return self::$mappings;
     }
 
-    private function docPropertiesOld(SimpleXMLElement $gnmXML): void
-    {
-        $docProps = $this->spreadsheet->getProperties();
-        foreach ($gnmXML->Summary->Item as $summaryItem) {
-            $propertyName = $summaryItem->name;
-            $propertyValue = $summaryItem->{'val-string'};
-            switch ($propertyName) {
-                case 'title':
-                    $docProps->setTitle(trim($propertyValue));
-
-                    break;
-                case 'comments':
-                    $docProps->setDescription(trim($propertyValue));
-
-                    break;
-                case 'keywords':
-                    $docProps->setKeywords(trim($propertyValue));
-
-                    break;
-                case 'category':
-                    $docProps->setCategory(trim($propertyValue));
-
-                    break;
-                case 'manager':
-                    $docProps->setManager(trim($propertyValue));
-
-                    break;
-                case 'author':
-                    $docProps->setCreator(trim($propertyValue));
-                    $docProps->setLastModifiedBy(trim($propertyValue));
-
-                    break;
-                case 'company':
-                    $docProps->setCompany(trim($propertyValue));
-
-                    break;
-            }
-        }
-    }
-
-    private function docPropertiesDC(SimpleXMLElement $officePropertyDC): void
-    {
-        $docProps = $this->spreadsheet->getProperties();
-        foreach ($officePropertyDC as $propertyName => $propertyValue) {
-            $propertyValue = trim((string) $propertyValue);
-            switch ($propertyName) {
-                case 'title':
-                    $docProps->setTitle($propertyValue);
-
-                    break;
-                case 'subject':
-                    $docProps->setSubject($propertyValue);
-
-                    break;
-                case 'creator':
-                    $docProps->setCreator($propertyValue);
-                    $docProps->setLastModifiedBy($propertyValue);
-
-                    break;
-                case 'date':
-                    $creationDate = strtotime($propertyValue);
-                    $docProps->setCreated($creationDate);
-                    $docProps->setModified($creationDate);
-
-                    break;
-                case 'description':
-                    $docProps->setDescription($propertyValue);
-
-                    break;
-            }
-        }
-    }
-
-    private function docPropertiesMeta(SimpleXMLElement $officePropertyMeta, array $namespacesMeta): void
-    {
-        $docProps = $this->spreadsheet->getProperties();
-        foreach ($officePropertyMeta as $propertyName => $propertyValue) {
-            $attributes = $propertyValue->attributes($namespacesMeta['meta']);
-            $propertyValue = trim((string) $propertyValue);
-            switch ($propertyName) {
-                case 'keyword':
-                    $docProps->setKeywords($propertyValue);
-
-                    break;
-                case 'initial-creator':
-                    $docProps->setCreator($propertyValue);
-                    $docProps->setLastModifiedBy($propertyValue);
-
-                    break;
-                case 'creation-date':
-                    $creationDate = strtotime($propertyValue);
-                    $docProps->setCreated($creationDate);
-                    $docProps->setModified($creationDate);
-
-                    break;
-                case 'user-defined':
-                    [, $attrName] = explode(':', $attributes['name']);
-                    switch ($attrName) {
-                        case 'publisher':
-                            $docProps->setCompany($propertyValue);
-
-                            break;
-                        case 'category':
-                            $docProps->setCategory($propertyValue);
-
-                            break;
-                        case 'manager':
-                            $docProps->setManager($propertyValue);
-
-                            break;
-                    }
-
-                    break;
-            }
-        }
-    }
-
-    private function docProperties(SimpleXMLElement $xml, SimpleXMLElement $gnmXML, array $namespacesMeta): void
-    {
-        if (isset($namespacesMeta['office'])) {
-            $officeXML = $xml->children($namespacesMeta['office']);
-            $officeDocXML = $officeXML->{'document-meta'};
-            $officeDocMetaXML = $officeDocXML->meta;
-
-            foreach ($officeDocMetaXML as $officePropertyData) {
-                $officePropertyDC = [];
-                if (isset($namespacesMeta['dc'])) {
-                    $officePropertyDC = $officePropertyData->children($namespacesMeta['dc']);
-                }
-                $this->docPropertiesDC($officePropertyDC);
-
-                $officePropertyMeta = [];
-                if (isset($namespacesMeta['meta'])) {
-                    $officePropertyMeta = $officePropertyData->children($namespacesMeta['meta']);
-                }
-                $this->docPropertiesMeta($officePropertyMeta, $namespacesMeta);
-            }
-        } elseif (isset($gnmXML->Summary)) {
-            $this->docPropertiesOld($gnmXML);
-        }
-    }
-
     private function processComments(SimpleXMLElement $sheet): void
     {
         if ((!$this->readDataOnly) && (isset($sheet->Objects))) {
@@ -450,7 +309,7 @@ public function loadIntoExisting(string $pFilename, Spreadsheet $spreadsheet): S
         $this->gnm = array_key_exists('gmr', $namespacesMeta) ? 'gmr' : 'gnm';
 
         $gnmXML = $xml->children($namespacesMeta[$this->gnm]);
-        $this->docProperties($xml, $gnmXML, $namespacesMeta);
+        (new Properties($this->spreadsheet))->readProperties($xml, $gnmXML, $namespacesMeta);
 
         $worksheetID = 0;
         foreach ($gnmXML->Sheets->Sheet as $sheet) {
diff --git a/src/PhpSpreadsheet/Reader/Gnumeric/Properties.php b/src/PhpSpreadsheet/Reader/Gnumeric/Properties.php
new file mode 100644
index 0000000000..16d9c2e082
--- /dev/null
+++ b/src/PhpSpreadsheet/Reader/Gnumeric/Properties.php
@@ -0,0 +1,167 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheet\Reader\Gnumeric;
+
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use SimpleXMLElement;
+
+class Properties
+{
+    /**
+     * @var Spreadsheet
+     */
+    protected $spreadsheet;
+
+    public function __construct(Spreadsheet $spreadsheet)
+    {
+        $this->spreadsheet = $spreadsheet;
+    }
+
+    private function docPropertiesOld(SimpleXMLElement $gnmXML): void
+    {
+        $docProps = $this->spreadsheet->getProperties();
+        foreach ($gnmXML->Summary->Item as $summaryItem) {
+            $propertyName = $summaryItem->name;
+            $propertyValue = $summaryItem->{'val-string'};
+            switch ($propertyName) {
+                case 'title':
+                    $docProps->setTitle(trim($propertyValue));
+
+                    break;
+                case 'comments':
+                    $docProps->setDescription(trim($propertyValue));
+
+                    break;
+                case 'keywords':
+                    $docProps->setKeywords(trim($propertyValue));
+
+                    break;
+                case 'category':
+                    $docProps->setCategory(trim($propertyValue));
+
+                    break;
+                case 'manager':
+                    $docProps->setManager(trim($propertyValue));
+
+                    break;
+                case 'author':
+                    $docProps->setCreator(trim($propertyValue));
+                    $docProps->setLastModifiedBy(trim($propertyValue));
+
+                    break;
+                case 'company':
+                    $docProps->setCompany(trim($propertyValue));
+
+                    break;
+            }
+        }
+    }
+
+    private function docPropertiesDC(SimpleXMLElement $officePropertyDC): void
+    {
+        $docProps = $this->spreadsheet->getProperties();
+        foreach ($officePropertyDC as $propertyName => $propertyValue) {
+            $propertyValue = trim((string) $propertyValue);
+            switch ($propertyName) {
+                case 'title':
+                    $docProps->setTitle($propertyValue);
+
+                    break;
+                case 'subject':
+                    $docProps->setSubject($propertyValue);
+
+                    break;
+                case 'creator':
+                    $docProps->setCreator($propertyValue);
+                    $docProps->setLastModifiedBy($propertyValue);
+
+                    break;
+                case 'date':
+                    $creationDate = strtotime($propertyValue);
+                    $creationDate = $creationDate === false ? time() : $creationDate;
+                    $docProps->setCreated($creationDate);
+                    $docProps->setModified($creationDate);
+
+                    break;
+                case 'description':
+                    $docProps->setDescription($propertyValue);
+
+                    break;
+            }
+        }
+    }
+
+    private function docPropertiesMeta(SimpleXMLElement $officePropertyMeta, array $namespacesMeta): void
+    {
+        $docProps = $this->spreadsheet->getProperties();
+        foreach ($officePropertyMeta as $propertyName => $propertyValue) {
+            if ($propertyValue === null) {
+                continue;
+            }
+
+            $attributes = $propertyValue->attributes($namespacesMeta['meta']);
+            $propertyValue = trim((string) $propertyValue);
+            switch ($propertyName) {
+                case 'keyword':
+                    $docProps->setKeywords($propertyValue);
+
+                    break;
+                case 'initial-creator':
+                    $docProps->setCreator($propertyValue);
+                    $docProps->setLastModifiedBy($propertyValue);
+
+                    break;
+                case 'creation-date':
+                    $creationDate = strtotime($propertyValue);
+                    $creationDate = $creationDate === false ? time() : $creationDate;
+                    $docProps->setCreated($creationDate);
+                    $docProps->setModified($creationDate);
+
+                    break;
+                case 'user-defined':
+                    [, $attrName] = explode(':', $attributes['name']);
+                    switch ($attrName) {
+                        case 'publisher':
+                            $docProps->setCompany($propertyValue);
+
+                            break;
+                        case 'category':
+                            $docProps->setCategory($propertyValue);
+
+                            break;
+                        case 'manager':
+                            $docProps->setManager($propertyValue);
+
+                            break;
+                    }
+
+                    break;
+            }
+        }
+    }
+
+    public function readProperties(SimpleXMLElement $xml, SimpleXMLElement $gnmXML, array $namespacesMeta): void
+    {
+        if (isset($namespacesMeta['office'])) {
+            $officeXML = $xml->children($namespacesMeta['office']);
+            $officeDocXML = $officeXML->{'document-meta'};
+            $officeDocMetaXML = $officeDocXML->meta;
+
+            foreach ($officeDocMetaXML as $officePropertyData) {
+                $officePropertyDC = [];
+                if (isset($namespacesMeta['dc'])) {
+                    $officePropertyDC = $officePropertyData->children($namespacesMeta['dc']);
+                }
+                $this->docPropertiesDC($officePropertyDC);
+
+                $officePropertyMeta = [];
+                if (isset($namespacesMeta['meta'])) {
+                    $officePropertyMeta = $officePropertyData->children($namespacesMeta['meta']);
+                }
+                $this->docPropertiesMeta($officePropertyMeta, $namespacesMeta);
+            }
+        } elseif (isset($gnmXML->Summary)) {
+            $this->docPropertiesOld($gnmXML);
+        }
+    }
+}