Said Salomon Unitrin Direct Insurance T-SQL Date and Time Functions Said Salomon

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 DateTime  datetime  January 1, 1753, through December 31, 9999  00:00:00 through 23:59:  Accuracy Rounded to increments of.000,.003, or.007 seconds  Storage size 8 bytes

 smalldatetime  January 1, 1900, through June 6, 2079  00:00:00 through 23:59:59  Accuracy One minute  Size 4 bytes, fixed.

 datetime2(7)  January 1,1 AD through December 31, 9999 AD  00:00:00 through 23:59:  Accuracy 100 nanoseconds  Storage size 6 bytes for precisions less than 3; 7 bytes for precisions 4 and 5. All other precisions require 8 bytes.

 datetimeoffset(7)  January 1,1 AD through December 31, 9999 AD  00:00:00 through 23:59:  Time zone offset range -14:00 through +14:00  Accuracy 100 nanoseconds  Storage size 10 bytes, fixed is the default with the default of 100ns fractional second precision.

 date  January 1, 1 A.D. through December 31, 9999 A.D.  No time part  Accuracy One day  Storage size 3 bytes, fixed

 time(7)  No Date part  00:00:00 through 23:59:  Accuracy 100 nanoseconds  Storage size 5 bytes, fixed, is the default with the default of 100ns fractional second precision.

 GetDate()  Returns the current database system timestamp as a datetime value without the database time zone offset. This value is derived from the operating system of the computer on which the instance of SQL Server is running.

 DATEADD (datepart, number, date )  Returns a specified date with the specified number interval (signed integer) added to a specified datepart of that date.

 DATEDIFF ( datepart, startdate, enddate )  Returns the number of date and time boundaries crossed between two specified dates.

 DATENAME ( datepart,date )  Returns a character string that represents the specified datepart of the specified date

 DATEPART ( datepart, date )  Returns an integer that represents the specified datepart of the specified date.

 Returns an integer representing the day datepart of the specified date.

 GETUTCDATE()  Returns the datetime value that represents the current UTC time (Coordinated Universal Time or Greenwich Mean Time). The current UTC time is derived from the current local time and the time zone setting in the operating system of the computer on which the instance of Microsoft SQL Server is running.

 MONTH ( date )  Returns an integer that represents the month part of a specified date.

 YEAR ( date )  Returns an integer that represents the year part of a specified date.

 SYSDATETIME ()  Returns a datetime2(7) value that contains the date and time of the computer on which the instance of SQL Server is running.

 SYSDATETIMEOFFSET ()  Returns a datetimeoffset(7) value that contains the date and time of the computer on which the instance of SQL Server is running. The time zone offset is included.

 SYSUTCDATETIME ( )  Returns a datetime2 value that contains the date and time of the computer on which the instance of SQL Server is running. The date and time is returned as UTC time (Coordinated Universal Time). The fractional second precision specification has a range from 1 to 7 digits. The default precision is 7 digits.

 CURRENT_TIMESTAMP  Returns the current database system timestamp as a datetime value without the database time zone offset. This value is derived from the operating system of the computer on which the instance of SQL Server is running.  This function is the ANSI SQL equivalent to GETDATE.GETDATE

 SWITCHOFFSET (DATETIMEOFFSET,time_zone)  Returns a datetimeoffset value that is changed from the stored time zone offset to a specified new time zone offset.

 TODATETIMEOFFSET (expression,time_zone)  Returns a datetimeoffset value that is translated from a datetime2 expression.

 ISDATE (expression )  Returns 1 if the expression is a valid date, time, or datetime value; otherwise, 0.

 Not really date time functions but they can be useful to format or change date and times

 Date Time Functions Functions (books Online)  SQL Server 2008, Dev Edition  My Twitter SaidSalomon