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date arithmetic, to_char working fine but to_date not ?

Ahmed HaroonOct 25 2016 — edited Oct 26 2016

I was calculating period in months, following is screen shot, when using to_char for sysdate it is working fine but when using to_date it returns wrong value. please help to understand it.

I am using following DB version.

BANNER

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Oracle Database 11g Release 11.2.0.4.0 - 64bit Production

PL/SQL Release 11.2.0.4.0 - Production

CORE 11.2.0.4.0 Production

TNS for 64-bit Windows: Version 11.2.0.4.0 - Production

NLSRTL Version 11.2.0.4.0 - Production

Regards

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Locked on Nov 22 2016

Added on Oct 25 2016

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