Did you try this? I don't believe you can call 'getDate()' from a function in t-sql
I did try it. Just tried it again on SQL 2005, 2008 and 2008R2 CTP. Works. GETDATE makes the function non-deterministic which limits its use a little. From SQL2000 BOL: "In Microsoft SQL Server 2000, nondeterministic functions cannot be specified in two types of Transact-SQL expressions: * An index cannot be created on a computed column if the computed_column_expression references any nondeterministic functions. * A clustered index cannot be created on a view if the view references any nondeterministic functions."
Pretty sure this would not work on SQL 2000 since non-deterministic UDFs were new for 2005, but there are hack-arounds for that even. Worst case, you could mod the UDF to add a second datetime parameter were you'd pass in GETDATE().