Nellie,
It could be one of two things.
If the number is very small, such as 0.0004, Excel is interpreting
a date like "7/8/2003" to mean 7 divided by 8 divided by 2003. To
change this go to the Tools menu, choose Options, then the
Transition tab. There, clear the checks next to Transition Formula
Evaluation and Transition Formula Entry.
If the number is large, such as 37810, change the format of the
cell to a date format. Select the cell, the go to the Format menu
and choose Cells. In that dialog, choose the Number tab and choose
Date in the category list, and choose the data format you want.
--
Cordially,
Chip Pearson
Microsoft MVP - Excel
Pearson Software Consulting, LLC
www.cpearson.com (e-mail address removed)