Parameter Query on date using MS Query

I think this is an easy one!

I am querying on a date time field with e.g. 21/12/2003 07:00:00 and
just simply looking to filter for all times on a specific date using a
parameter query.(so keying 21/12/2003 in the parameter prompt returns
all items for that day although the timestamps will be different)

I guess I could create a calculated field using INT or similar but I'm
sure there is an easier way than that. I don't think that worked
anyway
because of the data type situation. Presumably using ROUND is not
appropriate.

Also tried criteria 'between [date1] and [date1]+1' but this is
rejected.

I am using MS Query grabbing the info from an Oracle database and
placing it into Excel.

I would really prefer to use a specific criteria rather than create an
additional calculated field but am interested in what's recommended.

Thanks

Brian