When setting the following strings as cell value, they are recognized as dates. In industry standard applications like MS Excel and OpenOffice, they are recognized as strings: - "12 3456" in bg-BG, fr-FR, ru-RU, sv-FI, en-US - "12.3456" in de-DE - "1 23" in en-US - "2013/5" in en-US - "3000-03" in en-US