Hi

If there are any empty cells in the range of dates, then Excel will not
group them.
Perhaps you have defined a range for your PT which included blank rows to
allow for future data input. That would cause it not to group.

Instead, define a dynamic range
InsertNameDefine
Name myData
Refers to =$A$1:INDEX($1:$65536,COUNTA($A:$A),COUNTA($1:$1))

Right click on the PTPT WizardBackSource = myDataFinish
Drag your date field off the PTRefreshDrag your date field back again and
try Grouping.

If that doesn't work for you, post back
--
Regards
Roger Govier

"acss" wrote in message
...
I have a pivot table containing dates, products and amount. I have right
clicked the date field to group the dates bi-weekly since the only dates
in
the column are 1/15/2009,1/31/2009,2/15/2009,2/28/2009..etc YET i receive
an
error that states "cannot group that selection".....i ensured it is in
date
format...what else could cause this???