Here is a list of the special formats available for use in datawindows and the String() function.

The Currency Format Set in Windows.	[currency]
Currency Format with extra decimal places	[currency]00
The Default Format for each datatype.	[general]
The Long Date Format Set in Windows.	[longdate]
The Short Date Format Set in Windows.	[shortdate]
The Time Format Set in Windows.	[time]

The Windows settings can be found in Control Panel->Regional Settings.