I have a date in format \"4/5/2011\" (month/day/year) in a xlsx file in one of the cells. Im trying to parse the file and load those data in some classes.
I had same issue - switched to EPPlus http://epplus.codeplex.com/
Note that it has LGPL license. So if you need your code base to be safe from GPL issue, simply use the library as is and your original code base license is safe.