How to calculate two business days in Oracle

1146765 pts.
Tags:
Oracle
SQL
I've been trying to calculate business days between two different dates in Oracle select. I've reached the point that my calculation is giving me the correct results (mostly) for the dates but sometimes it varies from 2 days to -2 days. Here's what I have:
SELECT
((to_char(CompleteDate,'J') - to_char(InstallDate,'J'))+1) - (((to_char(CompleteDate,'WW')+ (52 * ((to_char(CompleteDate,'YYYY') - to_char(InstallDate,'YYYY'))))) - to_char(InstallDate,'WW'))*2) as BusinessDays
FROM TABLE
Thank you so much!
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