I am setting a data-driven subscription in SSRS with what I hope to be a parameter for a date/time variable. The business requirement is that I pass a Parmenter to the report that needs to be set to yesterday's date from when the subscribed email alert is sent.

This is a query I am using in a data-driven subscription in SSRS. How to I make the following SQL query return the previous date instead of the current system date:
    SELECT CONVERT (date, SYSDATETIME()) as rundate