The American Perforator 400 DATER security perforator is one of the most popular models because of its changeable date capability. The perforation appears in the M D Y format; a D M Y model is also available upon request. The 400 Dater Perforator is used to punch a date line to provide authenticity on receipts, payments, expirations and more. Optional line with text characters or numbers can be added to this model.