You can construct CYYDDD format for the current date as:
floor((extract(year from sysdate) - 1900) / 100) || to_char(sysdate, 'RRDDD')
You can then use this in a WHERE clause:
jdate < floor((extract(year from sysdate) - 1900) / 100) || to_char(sysdate, 'RRDDD')
CLICK HERE to find out more related problems solutions.