Perhaps it is a 'text date'. Select the date(s), Data > Text to columns. Click Next twice to take you to the 3rd screen. Check Date and select YMD on the drop-down, then click Finish. That should convert it to a 'real' date and the custom formatting should work.
I import the data from the database into a worksheet then query the data to make pivot tables. I have tried formating the imported data but nothing happens. My guess is that i have to somehow convert the data to something that excel understands.
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