Evidently you've got files on your server that aren't truly updated to v1.3.9, which is when the date_diff() function in Zen Cart was renamed to avoid clashes with PHP5 changes.
Time to do a compare of all your files and clean up whatever's not correct. http://www.zen-cart.com/wiki/index.p...Obscure_Issues
Wouldn't hurt to finish your upgrade to the latest version while you're at it.
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29 Aug 2011, 08:49 AM #2
Sensei
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Re: date_diff error with version 3.9f
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