If you're using
DateTime.ParseExact with a custom format string including slashes, don't forget to escape them.
After I've catched
FormatExceptions several times, I've found this explanation:
'/' is the default date separator defined in DateTimeFormatInfo.DateSeparator. Therefore you have to escape '/' with '\' if you want to use it:
System.DateTime.ParseExact("2004/05/31 16:19:43", @"yyyy\/MM\/dd HH:mm:ss", null);