Hi Tam
depends on what you want ... if you have
..........A...............B.............
1......Item..........Update Date
and you want the relevant update date to turn red when it is more than a
year ago ... then
select from B2 to the end of the column of data and then scroll so that row
2 is at the top of the screen (first line you can see)
choose
format / conditional formatting
choose
formula is
type
=$B2<=today()-365
click the format button, set the background colour (under the patterns tab)
to whatever you want (etc)
click OK twice