To specify a date, such as December 31, 1991, the range of numbers for each DateSerial argument should be in the accepted range for the unit; that is, 1–31 for days and 1–12 for months. However, you can also specify relative dates for each argument using any numeric expression that represents some number of days, months, or years before or after a certain date.
The following example uses numeric expressions instead of absolute date numbers. Here the DateSerial function returns a date that is the day before the first day (1 - 1),
two months before August (8 - 2), 10 years before 1990 (1990 - 10); in other words, May 31, 1980.
DateSerial(1990 - 10, 8 - 2, 1 - 1)
For the year argument, values between 0 and 99, inclusive, are interpreted as the years 1900–1999.
For all other year arguments, use a four-digit year (for example, 1800).
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