Because Excel stores dates as serial values, it is unaffected by most garden-variety Y2K prob-
lems. In practice, however, you might encounter Y2K problems if you enter or import data
that includes only two digits for the year. When Excel encounters dates in this format, it has
to convert the year to four digits; in the process, it’s possible to select the wrong century.
When translating two-digit years, Excel uses the following rules:
■Excel automatically converts dates entered using the two-digit years 00 through 29 to
the years 2000 through 2029. Thus, if you enter or import the value
5/23/04, Excel
stores ...
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