excel formula to subtract number of days from a date

Question

is there a way in Excel to have a formula that does something like this:

= 12/20/2010 - 180

which would take a certain date (12/20/2010 in this case) and subtrac

Answer 1

Assuming the original date is in cell A1:

=A1-180

Works in at least Excel 2003 and 2010.