diff --git a/src/Reader/XLSX/Helper/CellValueFormatter.php b/src/Reader/XLSX/Helper/CellValueFormatter.php
index 776de0a..bc7a5c4 100644
--- a/src/Reader/XLSX/Helper/CellValueFormatter.php
+++ b/src/Reader/XLSX/Helper/CellValueFormatter.php
@@ -284,9 +284,13 @@ final class CellValueFormatter
         \assert(false !== $dateObj);
 
         if ($this->shouldFormatDates) {
-            $styleNumberFormatCode = $this->styleManager->getNumberFormatCode($cellStyleId);
-            $phpDateFormat = DateFormatHelper::toPHPDateFormat($styleNumberFormatCode);
+            //$styleNumberFormatCode = $this->styleManager->getNumberFormatCode($cellStyleId);
+            //$phpDateFormat = DateFormatHelper::toPHPDateFormat($styleNumberFormatCode);
+            // Toujours utiliser le format français complet
+            $phpDateFormat = "d/m/Y H:i:s";
             $cellValue = $dateObj->format($phpDateFormat);
+            // Enlever la composante heure si elle n'existe pas
+            $cellValue = preg_replace('/ 00:00:00$/', "", $cellValue);
         } else {
             $cellValue = $dateObj;
         }
diff --git a/src/Reader/XLSX/Options.php b/src/Reader/XLSX/Options.php
index 636d2a4..e8609b5 100644
--- a/src/Reader/XLSX/Options.php
+++ b/src/Reader/XLSX/Options.php
@@ -10,7 +10,7 @@ final class Options
 {
     use TempFolderOptionTrait;
 
-    public bool $SHOULD_FORMAT_DATES = false;
+    public bool $SHOULD_FORMAT_DATES = true;
     public bool $SHOULD_PRESERVE_EMPTY_ROWS = false;
     public bool $SHOULD_USE_1904_DATES = false;
     public bool $SHOULD_LOAD_MERGE_CELLS = false;
diff --git a/src/Writer/AbstractWriter.php b/src/Writer/AbstractWriter.php
index eef34fb..a22e90f 100644
--- a/src/Writer/AbstractWriter.php
+++ b/src/Writer/AbstractWriter.php
@@ -13,6 +13,12 @@ abstract class AbstractWriter implements WriterInterface
     /** @var resource Pointer to the file/stream we will write to */
     protected $filePointer;
 
+    /**
+     * @var bool faut-il garder ouvert le flux quand {@link self::close()} est
+     * appelé?
+     */
+    protected bool $dontCloseFilePointer = false;
+
     /** @var string document creator */
     protected string $creator = 'OpenSpout';
 
@@ -20,7 +26,7 @@ abstract class AbstractWriter implements WriterInterface
     protected static string $headerContentType;
 
     /** @var string Path to the output file */
-    private string $outputFilePath;
+    private ?string $outputFilePath;
 
     /** @var bool Indicates whether the writer has been opened or not */
     private bool $isWriterOpened = false;
@@ -51,6 +57,20 @@ abstract class AbstractWriter implements WriterInterface
         $this->isWriterOpened = true;
     }
 
+    final public function writeToStream($filePointer): void
+    {
+        if (!is_resource($filePointer)) {
+            throw new IOException("filePointer is not a resource");
+        }
+        $this->outputFilePath = null;
+
+        $this->filePointer = $filePointer;
+        $this->dontCloseFilePointer = true;
+
+        $this->openWriter();
+        $this->isWriterOpened = true;
+    }
+
     /**
      * @codeCoverageIgnore
      *
@@ -140,7 +160,9 @@ abstract class AbstractWriter implements WriterInterface
 
         $this->closeWriter();
 
-        fclose($this->filePointer);
+        if (!$this->dontCloseFilePointer) {
+            fclose($this->filePointer);
+        }
 
         $this->isWriterOpened = false;
     }