This is a great question! A user defined function is a subroutine that encapsulates a piece of logic that can be...
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reused. At a high level functions are either deterministic or nondeterministic which means they either return the same value with the same input values each time the function is called or not. SQL Server ships with a number of date and time functions that may address your needs. These functions include: GETDATE, DATEADD, DATEDIFF, DATEPART, etc. I would recommend reviewing these links to create your own user defined function to meet your specific application needs!
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