Variable substitution in Unit Testing validation - Date format?

Question

Using SQL Developer unit testing, I am having difficulty comparing Date datatype in a validation.
I use a Dynamic Value Query to set the parameters of an insertion procedure under test.
select * from (select doc_nbr as p_mstr_doc_nbr, doc_nbr as p_assoc_doc_nbr, sysdate as p_date_added from documents sample(0.01) order by dbms_random.random)  where rownum <= 1;So P_DATE_ADDED is a DATE datatype.
I wish to validate that the insertion was correct. So I run a Process Validation returning one or more rows.
SELECT * FROM X100_ASSOC
  WHERE MSTR_DOC_NBR = '{P_MSTR_DOC_NBR}'
    AND ASSOC_DOC_NBR = '{P_ASSOC_DOC_NBR}'
    AND to_char(DATE_ADDED,'dd-MON-yy HH24:MI:SS')  = {P_DATE_ADDED};I understand that the {P_DATE_ADDED} is substituting in a string. From Help page :
"What is actually substituted is the string representation of the parameter value. For example:
If P1 is a parameter of type NUMBER and has the value 2.1, the string {P1} will be replaced by the string 2.1.
If P1 is a parameter of type VARCHAR2 and has the value ABC, the string '{P1}' will be replaced by the string 'ABC'. (Note the single-quotation marks around {P1} in this example.)"
I need to know the format that the date is cast into as a string. Then I can do the comparision on the where clause.
Any answers? or details of where is more in depth documentation?
Thank you,
Bill

Answer 1

I agree as a general rule. However in this case, it appears that the variable substitution routine is returning the default format. So to compare my expected data to the returned data I choose to use the default format. If the variable substitution routine specified an explicit format, I would use that. In my original question, I asked if anyone knew the format.
Regards,
Bill