The list of values that can be passed to the FormatSpecifier property can be found in the "Format Specifiers and Format Providers" topic of the .NET Framework.
The first example modifies the System.Globalization.DateTimeFormatInfo.DateSeparator property of an instance of a System.Globalization.DateTimeFormatInfo object and then assigns the DateTimeFormatInfo object to the FormatProvider property. The second example, modifies the DateTimeFormatInfo object in the same manner but also specifies the format of the column to display the contents of the cell in "short date" format:
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2