How to set datetime2 to mandate?

I want to create a SQL Script to clean datetime2 field and set it up to datetime2 begin '1-1-0001 12:00:00'. How to set GETDATE() to '1-1-0001 12:00:00' instead of using convert function ? UPDATE XYZTable SET ReferralDate = CONVERT(datetime2, '1/1/0001 09:00')