IS THERE A FUNCTION TO RETURN THE NUMBER OF MONTHS OR DAYS?

I know that you can do a months between function between 2 dates divided by 12 and get years but is there a function that can return the number of months between 2 dates or the number of days between 2 dates in a select statement for a report? These 2 dates are entered in an Oracle forms.
I have 2 dates.
BEG_SVC_DT 30-JUL-1995 DATE FORMAT
END_SVC_DT 981007 VARCHAR2 FORMAT Positions 5 and 6 are the days.
I must subtract BEG_SVC_DT from END_SVC_DT.
In PLSQL I add 31 to 07 and get 38. I subtract 30 from 38 and get 8.
or I have 2 dates
BEG_SVC_DT 10-JAN-2003 DATE FORMAT
END_SVC_DT 050924 VARCHAR2 FORMAT Positions 5 and 6 are the days.
I must subtract BEG_SVC_DT from END_SVC_DT.
In PLSQL I subtract 10 from 24 and get 14.
In both scenarios the end_dt field must be VARCHAR2 because the user has to enter the word 'PRESENT' . Is there a function in SQL that would compute the
number of days between 2 dates?
Is there a function to get the number of months between 2 dates?
I have 2 dates.
BEG_SVC_DT 12-JUL-2004 DATE FORMAT
END_SVC_DT 050807 VARCHAR2 FORMAT Positions 3 and 4 are months.
I must subtract BEG_SVC_DT from END_SVC_DT
JUL is the 7th month.
In PLSQL, I subtract 07 from 08 and get 01
Or I have 2 dates
BEG_SVC_DT 13-NOV-2004 DATE FORMAT
END_SVC_DT 050429 VARCHAR2 FORMAT Positions 3 and 4 are months.
I must subtract BEG_SVC_DT from END_SVC_DT.
NOV is the eleventh month. 04 is less than 11.
In PLSQL I have to add 12 to 04 and subtract 11 from 16 to get 05.
In both scenarios, the end_dt field must be VARCHAR2 because the user has to enter the word 'PRESENT'. In SQL, is there a function to compute the number of months between 2 dates?
I am doing my calculations this way because this is the way that the user has been doing them when they created the report manually.
The database that I am using is Oracle 9.2.0.6
Report Writer Report Builder 6.0.8.22.0
Forms 6.0.8.22.1

In your example:
BEG_SVC_DT 30-JUL-1995 DATE FORMAT
END_SVC_DT 981007 VARCHAR2 FORMAT Positions 5 and 6 are the days.
I must subtract BEG_SVC_DT from END_SVC_DT.
In PLSQL I add 31 to 07 and get 38. I subtract 30 from 38 and get 8.
Where is the "31" depending on, on year and month of BEG_SVC_DT or END_SVC_DT?
What would be the answer for the following example
BEG_SVC_DT 25-FEB-1995 DATE FORMAT
END_SVC_DT 980407 VARCHAR2 FORMAT
Do I add 28 (=number of days in FEB-1995),
or 30 (=number of days in APR-1998),
or 31 (= max number of days in any month?)

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Hi,
I'm writing a function that return a number. I receive always an error (invalid number) but I don't understand why.
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*Cause:
*Action:
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Could someone help me?
Thanks bye bye.

I changed in this way:
FUNCTION COUNT_OBJECT(workflow_name_p IN VARCHAR2, object_type_p IN VARCHAR2) RETURN NUMBER
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object_inserted NUMBER;
table_name_p VARCHAR2(4000);
query_stmt VARCHAR2(4000);
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SELECT SUM(B.STOREDOBJS) INTO object_present
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SELECT 'AIM.'||B.TABLE_NAME INTO table_name_p
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00911. 00000 - "invalid character"
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but the line 504 is the blank line higlighted with the ***.
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