- ASTROCLK Astronomical Clock and Celestial Tracking Program 互联网档案馆的存档，存档日期2007-09-28. (page 110)
- XL2000: Early Dates on Office Spreadsheet Component Differ from Excel. Microsoft. [2007-12-08]. （原始内容存档于2012-03-12）.
In the Microsoft Office Spreadsheet Component, the value 0 evaluates to the date December 30, 1899 and the value 1 evaluates to December 31, 1899. ... In Excel, the value 0 evaluates to January 0, 1900 and the value 1 evaluates to January 1, 1900.
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