When copying folder to external drive, "An older item named.." appears even when the dates are the same

When I am manually backing up folders from Macbook Pro Mountain Lion to an external drive, the dates for folders are being misread? It will say "An older item named.." every time. I checked the dates and times and they are the same on Mountain Lion and the External drive for the files and the folders. It should send me back a message saying "An item named “” already exists in this location. Do you want to replace it with the one you’re moving?"
When I try to move an individual file to the external drive and the dates are the same, I get the correct message - "an item named "" already exists..." so the issue is only with the folders.
I have only had this issue since the update to OS 10.8. Any Suggestions? thanks

The modification date of a file is stored internally in seconds. The Finder rounds off to the nearest minute. If the age of two files differs by less than 30 seconds, they'll seem to have the same modification date in the Finder.

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