SQL Server DateTime Related...

CONVERT

CONVERT function explicitly converts an expression of one data type to another. CAST and CONVERT provide similar functionality.

Syntax

CAST ( expression AS data_type )

CONVERT ( data_type [ ( length ) ] , expression [ , style ] )

Arguments

expression

Is any valid Microsoft SQL Server expression.

data_type

Is the target system-supplied data type, including bigint and sql_variant. User-defined data types cannot be used.

length

Is an optional parameter of nchar, nvarchar, char, varchar, binary, or varbinary data types.

style

Is the style of date format used to convert datetime or smalldatetime data to character data (nchar, nvarchar, char, varchar, nchar, or nvarchar data types), or the string format when converting float, real, money, or smallmoney data to character data (nchar, nvarchar, char, varchar, nchar, or nvarchar data types).

yy	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	Kuwaiti	dd mon yyyy hh:mi:ss:mmmAM
-	131	Kuwaiti	dd/mm/yy hh:mi:ss:mmmAM

Some Other Date Related Functions...

Dateadd: Returns a new datetime value based on adding an interval to the specified date.

Syntax: DATEADD ( datepart, number, date )

Datediff: Returns the number of date and time boundaries crossed between two specified dates.

Syntax: DATEDIFF ( datepart, startdate, enddate )

Datename: Returns a character string representing the specified datepart of the specified date.

Syntax: DATENAME ( datepart, date )

Datepart: Returns an integer representing the specified datepart of the specified date.

Syntax: DATEPART ( datepart, date )

Day: Returns an integer representing the day datepart of the specified date.

Syntax: DAY ( date )

Getdate: Returns the current system date and time in the Microsoft® SQL Server™ standard internal format for datetime values.

Syntax: GETDATE ( )

Month: Returns an integer that represents the month part of a specified date.

Syntax: MONTH ( date )

Year: Returns an integer that represents the year part of a specified date.

Syntax: YEAR ( date )

Here,

datepart--> may be mm, dd, yy, yyyy, mi..etc...

Example:

PRINT DATEADD ( dd, 60, 'Sep 1 2007 10:46AM')

will prints
Oct 31 2007 10:46AM