Is this calendar quarter (e.g., Jan-Mar, Apr-Jun, Jul-Sep, Oct-Dec), or in the last three months?
If it's calendar quarter, use the DatePart function - datepart('q', {table.datefield}) will get you the calendar quarter of a date field.
If it's "in the last three months", try this:
{table.datefield} >= dateadd("m", -3, currentdate)
-Dell
A computer only does what you actually told it to do - not what you thought you told it to do.