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Datetime or smalldatetime conversion to character data. Add 100 to a style value to get a four-place year that includes the century (yyyy).

Without century (yy)	With century (yyyy)	Standard	Input/Output**
-	0 or 100 (*)	Default	mon dd yyyy hh:miAM (or PM)
1	101	USA	mm/dd/yy
2	102	ANSI	yy.mm.dd
3	103	British/French	dd/mm/yy
4	104	German	dd.mm.yy
5	105	Italian	dd-mm-yy
6	106	-	dd mon yy
7	107	-	Mon dd, yy
8	108	-	hh:mm:ss
-	9 or 109 (*)	Default + milliseconds	mon dd yyyy hh:mi:ss:mmmAM (or PM)
10	110	USA	mm-dd-yy
11	111	JAPAN	yy/mm/dd
12	112	ISO	yymmdd
-	13 or 113 (*)	Europe default + milliseconds	dd mon yyyy hh:mm:ss:mmm(24h)
14	114	-	hh:mi:ss:mmm(24h)
-	20 or 120 (*)	ODBC canonical	yyyy-mm-dd hh:mi:ss(24h)
-	21 or 121 (*)	ODBC canonical (with milliseconds)	yyyy-mm-dd hh:mi:ss.mmm(24h)
-	126(***)	ISO8601	yyyy-mm-dd Thh:mm:ss.mmm(no spaces)
-	130*	Hijri****	dd mon yyyy hh:mi:ss:mmmAM
-	131*	Hijri****	dd/mm/yy hh:mi:ss:mmmAM

Please check http://msdn.microsoft.com/en-us/library/aa226054(SQL.80).aspx for detail.