Data Types in X++

The following table provides an overview of the simple data types available in Microsoft Dynamics AX:

Data Type	Description	Example	Declaration Keyword
String	A string is a number of characters. X++ supports several types of strings: Left aligned, right aligned, fixed length or not fixed length. The maximum length of a string is 999 characters.	Name	str
Integer	An integer, also named a natural figure, is a number without a decimal point.	1090	int
Real	Reals, also named decimals, are numbers with a decimal point.	3.14	real
Date	The date type contains day, month, and year.	10\29\1978	date
UTC DateTime	Contains year, month, day, hour, minute and second.	9/28/2008 07:11:02 am	utcDateTim e
Enum	Enum values are represented internally as integers. The first literal has the number 0, the next number 1, the next number 2, and so on. You can use enums as integers in expressions.	NoYes	Must be declared as a Base Enum first
Boolean	Booleans can only contain the values false and true. The enum values false and true are predefined in X++ and recognized by the compiler.	TRUE	boolean
Time	Contains hours, minutes, and seconds. To declare a time, use the system type timeOfDay.	15:23:08	timeOfDay
GUID	Global Unique Identifier (GUID) is a reference number which is unique in any context.	{3F2504E0- 4F89-11D3- 9A0C- 0305E82C3 301}	guid
Int64	A large integer, represented by 64 bits.	5637144579	Int64