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From Search SQL Server]
In this article, I explain how to convert DATETIME and SMALLDATETIME data types to character data and how character data can be converted to date/time data. Specifically, the article describes how Transact-SQL supports two built-in functions for converting data in SQL Server -- implicit conversion and explicit conversion.
The article continues at
http://searchsqlserver.techtarget.com/tip/0,289483,sid87_gci1324835,00.html