Year 10,000 problem
This is also a problem because the "000's" might be confused with the standard digits "00's", representing a new century. Also, the year can overflow with certain computer programs. For example: in Microsoft Excel, 12/31/9999 is considered a valid date, but 1/1/10000 is invalid and will raise errors. The date "ten thousand" is unable to be supported, producing a large negative instead.