diff --git a/src/ext/spreadsheet/wsutils.php b/src/ext/spreadsheet/wsutils.php
index 0f83442..cc7107a 100644
--- a/src/ext/spreadsheet/wsutils.php
+++ b/src/ext/spreadsheet/wsutils.php
@@ -1,10 +1,31 @@
 <?php
 namespace nur\sery\ext\spreadsheet;
 
+use nur\sery\ValueException;
 use PhpOffice\PhpSpreadsheet\Cell\Coordinate;
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
 use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet;
 
 class wsutils {
+  static function get_ws(?string $wsname, Spreadsheet $ss, bool $create=false): ?Worksheet {
+    if ($wsname == null) {
+      $ws = $ss->getActiveSheet();
+    } elseif (is_numeric($wsname)) {
+      $sheetCount = $ss->getSheetCount();
+      if ($wsname < 1 || $wsname > $sheetCount) {
+        throw ValueException::invalid_value($wsname, "sheet index");
+      }
+      $ws = $ss->getSheet($wsname - 1);
+    } else {
+      $ws = $ss->getSheetByName($wsname);
+      if ($ws === null) {
+        if ($create) $ws = $ss->createSheet()->setTitle($wsname);
+        else throw ValueException::invalid_value($wsname, "sheet name");
+      }
+    }
+    return $ws;
+  }
+
   static function get_highest_coords(Worksheet $ws): array {
     $highestColumnA = $ws->getHighestColumn();
     $highestCol = Coordinate::columnIndexFromString($highestColumnA);
diff --git a/src/file/csv/AbstractReader.php b/src/file/csv/AbstractReader.php
new file mode 100644
index 0000000..e5b2a15
--- /dev/null
+++ b/src/file/csv/AbstractReader.php
@@ -0,0 +1,45 @@
+<?php
+namespace nur\sery\file\csv;
+
+use IteratorAggregate;
+
+abstract class AbstractReader  implements IReader {
+  const SCHEMA = null;
+
+  const HEADERS = null;
+
+  /** @var ?string nom du fichier depuis lequel lire */
+  const INPUT = null;
+
+  function __construct($input, ?array $params=null) {
+    if ($input !== null) $params["input"] = $input;
+    #
+    $this->schema = $params["schema"] ?? static::SCHEMA;
+    $this->headers = $params["headers"] ?? static::HEADERS;
+    $this->input = $params["input"] ?? static::INPUT;
+  }
+
+  protected ?array $schema;
+
+  protected ?array $headers;
+
+  protected $input;
+
+  protected int $isrc = 0, $idest = 0;
+
+  protected function cook(array &$row): bool {
+    if ($this->isrc == 0) {
+      # ligne d'en-tête
+      $headers = $this->headers;
+      if ($headers === null) {
+        if ($this->schema === null) $headers = null;
+        else $headers = array_keys($this->schema);
+        if ($headers === null) $headers = $row;
+        $this->headers = $headers;
+      }
+      return false;
+    }
+    $row = array_combine($this->headers, $row);
+    return true;
+  }
+}
diff --git a/src/file/csv/CsvReader.php b/src/file/csv/CsvReader.php
new file mode 100644
index 0000000..f83c507
--- /dev/null
+++ b/src/file/csv/CsvReader.php
@@ -0,0 +1,29 @@
+<?php
+namespace nur\sery\file\csv;
+
+use nur\sery\file\FileReader;
+use nur\sery\php\time\Date;
+use nur\sery\php\time\DateTime;
+
+class CsvReader extends AbstractReader {
+  function getIterator() {
+    $reader = new FileReader($this->input);
+    while (($row = $reader->fgetcsv()) !== null) {
+      foreach ($row as &$col) {
+        # conversion Date et DateTime
+        if (DateTime::isa_datetime($col, true)) {
+          $col = new DateTime($col);
+        } elseif (DateTime::isa_date($col, true)) {
+          $col = new Date($col);
+        }
+      }; unset($col);
+
+      if ($this->cook($row)) {
+        yield $row;
+        $this->idest++;
+      }
+      $this->isrc++;
+    }
+    $reader->close();
+  }
+}
diff --git a/src/file/csv/IReader.php b/src/file/csv/IReader.php
new file mode 100644
index 0000000..c944aad
--- /dev/null
+++ b/src/file/csv/IReader.php
@@ -0,0 +1,7 @@
+<?php
+namespace nur\sery\file\csv;
+
+use IteratorAggregate;
+
+interface IReader extends  IteratorAggregate {
+}
diff --git a/src/file/csv/SsBuilder.php b/src/file/csv/SsBuilder.php
index 85b83a3..6525f02 100644
--- a/src/file/csv/SsBuilder.php
+++ b/src/file/csv/SsBuilder.php
@@ -3,6 +3,7 @@ namespace nur\sery\file\csv;
 
 use nur\sery\ext\spreadsheet\wsutils;
 use nur\sery\os\path;
+use nur\sery\ValueException;
 use nur\sery\web\http;
 use PhpOffice\PhpSpreadsheet\Cell\IValueBinder;
 use PhpOffice\PhpSpreadsheet\Cell\StringValueBinder;
@@ -19,11 +20,14 @@ use PhpOffice\PhpSpreadsheet\Writer\Xlsx;
 class SsBuilder extends AbstractBuilder {
   use TAbstractBuilder;
 
+  /** @var ?string nom de la feuille dans laquelle écrire */
+  const WSNAME = null;
+
   function __construct(?string $output, ?array $params=null) {
     parent::__construct($output, $params);
     $this->ss = new Spreadsheet();
     $this->valueBinder = new StringValueBinder();
-    $this->setWsname($params["wsname"] ?? null);
+    $this->setWsname($params["wsname"] ?? static::WSNAME);
   }
 
   protected Spreadsheet $ss;
@@ -45,6 +49,12 @@ class SsBuilder extends AbstractBuilder {
     $this->rowStyle = self::STYLE_ROW;
     if ($wsname === null) {
       $ws = $ss->getActiveSheet();
+    } elseif (is_numeric($wsname)) {
+      $sheetCount = $ss->getSheetCount();
+      if ($wsname < 1 || $wsname > $sheetCount) {
+        throw ValueException::invalid_value($wsname, "sheet index");
+      }
+      $ws = $ss->getSheet($wsname - 1);
     } else {
       $ws = $ss->getSheetByName($wsname);
     }
diff --git a/src/file/csv/SsReader.php b/src/file/csv/SsReader.php
new file mode 100644
index 0000000..3ce06e6
--- /dev/null
+++ b/src/file/csv/SsReader.php
@@ -0,0 +1,124 @@
+<?php
+namespace nur\sery\file\csv;
+
+use nur\sery\cl;
+use nur\sery\ext\spreadsheet\wsutils;
+use nur\sery\file\web\Upload;
+use nur\sery\php\time\Date;
+use nur\sery\php\time\DateTime;
+use PhpOffice\PhpSpreadsheet\Cell\DataType;
+use PhpOffice\PhpSpreadsheet\IOFactory;
+use PhpOffice\PhpSpreadsheet\RichText\RichText;
+
+class SsReader extends AbstractReader {
+  static function with(Upload $upload): IReader {
+    if ($upload->isExt(".csv")) {
+      return new CsvReader($upload->tmpName);
+    } else {
+      return new static($upload->tmpName);
+    }
+  }
+
+  const DATETIME_FORMAT = 'dd/mm/yyyy hh:mm:ss';
+  const DATE_FORMAT = 'dd/mm/yyyy';
+  const TIME_FORMAT = 'hh:mm:ss';
+  const FORMAT_MAPPINGS = [
+    'mm/dd hh' => self::DATETIME_FORMAT,
+    'dd/mm hh' => self::DATETIME_FORMAT,
+    'mm/dd hh:mm' => self::DATETIME_FORMAT,
+    'dd/mm hh:mm' => self::DATETIME_FORMAT,
+    'mm/dd hh:mm:ss' => self::DATETIME_FORMAT,
+    'dd/mm hh:mm:ss' => self::DATETIME_FORMAT,
+    'mm/dd/yyyy hh' => self::DATETIME_FORMAT,
+    'dd/mm/yyyy hh' => self::DATETIME_FORMAT,
+    'mm/dd/yyyy hh:mm' => self::DATETIME_FORMAT,
+    'dd/mm/yyyy hh:mm' => self::DATETIME_FORMAT,
+    'mm/dd/yyyy hh:mm:ss' => self::DATETIME_FORMAT,
+    'dd/mm/yyyy hh:mm:ss' => self::DATETIME_FORMAT,
+    'yyyy/mm/dd hh' => self::DATETIME_FORMAT,
+    'yyyy/mm/dd hh:mm' => self::DATETIME_FORMAT,
+    'yyyy/mm/dd hh:mm:ss' => self::DATETIME_FORMAT,
+
+    'mm/dd' => self::DATE_FORMAT,
+    'dd/mm' => self::DATE_FORMAT,
+    'mm/dd/yyyy' => self::DATE_FORMAT,
+    'dd/mm/yyyy' => self::DATE_FORMAT,
+    'yyyy/mm/dd' => self::DATE_FORMAT,
+    'mm/yyyy' => self::DATE_FORMAT,
+
+    'hh AM/PM' => self::TIME_FORMAT,
+    'hh:mm AM/PM' => self::TIME_FORMAT,
+    'hh:mm:ss AM/PM' => self::TIME_FORMAT,
+    'hh' => self::TIME_FORMAT,
+    'hh:mm' => self::TIME_FORMAT,
+    'hh:mm:ss' => self::TIME_FORMAT,
+    '[hh]:mm:ss' => self::TIME_FORMAT,
+    'mm:ss' => self::TIME_FORMAT,
+  ];
+
+  /** @var ?string nom de la feuille depuis laquelle lire */
+  const WSNAME = null;
+
+  function __construct($input, ?array $params=null) {
+    parent::__construct($input, $params);
+    $this->wsname = $params["wsname"] ?? static::WSNAME;
+  }
+
+  protected ?string $wsname;
+
+  function getIterator() {
+    $ss = IOFactory::load($this->input);
+    $ws = wsutils::get_ws($this->wsname, $ss);
+
+    [$nbCols, $nbRows] = wsutils::compute_max_coords($ws);
+    $this->isrc = $this->idest = 0;
+    for ($nrow = 1; $nrow <= $nbRows; $nrow++) {
+      $row = [];
+      for ($ncol = 1; $ncol <= $nbCols; $ncol++) {
+        if ($ws->cellExistsByColumnAndRow($ncol, $nrow)) {
+          $cell = $ws->getCellByColumnAndRow($ncol, $nrow);
+          $value = $cell->getValue();
+          if ($value instanceof RichText) {
+            $value = $value->getPlainText();
+          } else {
+            $dataType = $cell->getDataType();
+            if ($dataType == DataType::TYPE_NUMERIC || $dataType == DataType::TYPE_FORMULA) {
+              # si c'est un format date, le forcer à une valeur standard
+              $origFormatCode = $cell->getStyle()->getNumberFormat()->getFormatCode();
+              if (strpbrk($origFormatCode, "ymdhs") !== false) {
+                $formatCode = $origFormatCode;
+                $formatCode = preg_replace('/y+/', "yyyy", $formatCode);
+                $formatCode = preg_replace('/m+/', "mm", $formatCode);
+                $formatCode = preg_replace('/d+/', "dd", $formatCode);
+                $formatCode = preg_replace('/h+/', "hh", $formatCode);
+                $formatCode = preg_replace('/s+/', "ss", $formatCode);
+                $formatCode = preg_replace('/-+/', "/", $formatCode);
+                $formatCode = preg_replace('/\\\\ /', " ", $formatCode);
+                $formatCode = preg_replace('/;@$/', "", $formatCode);
+                $formatCode = cl::get(self::FORMAT_MAPPINGS, $formatCode, $formatCode);
+                if ($formatCode !== $origFormatCode) {
+                  $cell->getStyle()->getNumberFormat()->setFormatCode($formatCode);
+                }
+              }
+            }
+            $value = $cell->getFormattedValue();
+            # conversion Date et DateTime
+            if (DateTime::isa_datetime($value, true)) {
+              $value = new DateTime($value);
+            } elseif (DateTime::isa_date($value, true)) {
+              $value = new Date($value);
+            }
+          }
+        } else {
+          $value = null;
+        }
+        $row[] = $value;
+      }
+      if ($this->cook($row)) {
+        yield $row;
+        $this->idest++;
+      }
+      $this->isrc++;
+    }
+  }
+}