XL2000: Early Dates on Office Spreadsheet Component Differ from Excel

In the Microsoft Office Spreadsheet Component, when you type a value between 0 and 60 in a cell, and then format the cell using a date format, you see a different date than you would if you typed the same value in Microsoft Excel. Or, if you type an early date in the Office Spreadsheet Component and then click Export to Excel, the date in Excel may be different by one day.

For example, the following table illustrates date values and their corresponding dates in both the Microsoft Office Spreadsheet Component and Microsoft Excel:

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. This is different from Microsoft Excel. In Excel, the value 0 evaluates to January 0, 1900 and the value 1 evaluates to January 1, 1900. The date January 0, 1900 does not exist in the Microsoft Office Spreadsheet Component.

In addition, the Office Spreadsheet Component does not recognize the year 1900 as a leap year. After March 1, 1900, however, dates in the Microsoft Office Spreadsheet Component and Microsoft Excel begin to match.

For additional information about dates in the Microsoft Office Spreadsheet Component, click the article number below to view the article in the Microsoft Knowledge Base: