>Hello,
>I have a date that I am reading from SQL Server, and I want to test to see if it is at least 30 minutes in the past. How would I do this?

IF SQLDateTime+(30*60)>=DATETIME()
  * Less than 30 minutes ago
ELSE
  * more than 30 minutes ago
ENDIF

Update:
This assumes that your PC and the server that stored the SQL data (and how the time was stored) are in sync with each other.