setCellValueByColumnAndRow($column, $row, ''); return; } if (!$value instanceof \DateTime) { throw new \InvalidArgumentException('Unsupported value given, only DateTime is supported'); } $sheet->setCellValueByColumnAndRow($column, $row, Date::PHPToExcel($value)); $sheet->getStyleByColumnAndRow($column, $row)->getNumberFormat()->setFormatCode(self::TIME_FORMAT); } }