Q: What is the correct syntax for Paradox SQL (TQuery) to 
enter dates into a datefield?

A: Method #1:

  SELECT * FROM "ROD.DB" WHERE DATE >= '07/01/1997'

NOTE: The date format is up to the DB in use.  Oracle allows the 
DB Administrator to define the date format.  My Oracle system
wants this format: '01-jan-1998', but when Oracle sends dates
back to me, it uses a different format!

B: Method #2:

Use a parameter to hold the date.

   Query1.SQL.Add('SELECT * FROM "ROD.DB" WHERE DATE >= :StartDate');

Set the date into the paramerter like this:

   Query1.Params[0].AsDateTime := Now;

or, do it like this:

   Query1.ParamByName('StartDate').AsDateTime := Now;

Then, do a "prepare" to set the get the SQL ready to run:

   Query1.Prepare;

Then run it:

   Query1.Open;