Integer parameters not acceptible in WHERE clause with TO_DATE function.

Question

Please tell me why the following query is not acceptible in a BI Publisher (11.1.1.5) data set.
SELECT * FROM all_tables
WHERE
LAST_ANALYZED >= TO_DATE(:yyyy || '-' || :startmo || '-' || :startday, 'YYYY-MM-DD')
AND LAST_ANALYZED < TO_DATE(:yyyy || '-' || :endmo || '-' || :endday, 'YYYY-MM-DD')
Attempting to save the query results in:
"ORA-01858: a non-numeric character was found where a numeric was expected"
It doesn't work even if you surround the parameters with TO_NUMBER().
The query clearly works in SQL Developer.

Answer 1

Also, neither of the following work, even though they both work in SQL Developer:
SELECT table_name, last_analyzed
FROM all_tables
WHERE
LAST_ANALYZED >= (TO_DATE(:start_date, 'MM-DD-YYYY') + 1)
SELECT table_name, last_analyzed
FROM all_tables
WHERE
LAST_ANALYZED >= (TO_DATE(:start_date, 'MM-DD-YYYY') + INTERVAL '1' DAY)
These don't work in BIP even when the start_date parameter has a format set to the default MM-dd-yyyy. So to sum up, I can't use date parameters, nor can I use integers passed as date parts. What the fuck am I supposed to do?
After four years, your fucking date parameters still don't work! Fuck off Oracle. I'm going home, frustrated with your garbage as usual.