Hi,
I added an explicit cast in the SQL:
dateserial(extract(YEAR FROM m.taken)::int,'||p_month1||','||p_day1||') d1,
dateserial(extract(YEAR FROM m.taken)::int,'||p_month2||','||p_day2||') d2
The function now takes three integer parameters; there was no performance loss.
Thank you.
Dave