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By entering four-digit years, Excel won't interpret the century for you.
You can change the date system by doing the following: You can encounter problems when you copy and paste dates or when you create external references between workbooks based on the two different date systems.
For example, in Excel for Windows, January 1, 1900 is serial number 1, and January 1, 2008 is serial number 39448 because it is 39,448 days after January 1, 1900.
Excel stores times as decimal fractions because time is considered a portion of a day. Because dates and times are values, they can be added, subtracted, and included in other calculations.
For background information, see Date systems in Excel.
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You often ask questions such as: when was a product purchased, how long will a task in a project take, or what is the average revenue for a fiscal quarter?