Compute the age of a client at the midpoint of the year - 30-09-YYYY
See also
midpoint_fy
Other date functions:
calculate_stay(),
convert_date_to_numeric(),
convert_numeric_to_date(),
end_fy(),
end_fy_quarter(),
end_next_fy_quarter(),
fy_interval(),
is_date_in_fyyear(),
last_date_month(),
midpoint_fy(),
next_fy(),
start_fy(),
start_fy_quarter(),
start_next_fy_quarter()