[BUGS] BUG #14850: Implement optinal additinal parameter for 'justify'date/time function

The following bug has been logged on the website:

Bug reference:      14850
Logged by:          Eugen Konkov
Email address:      kes-kes@yandex.ru
PostgreSQL version: 10.0
Operating system:   Linux mint 18: Linux work 4.4.0-57-generic #78-Ubu
Description:

Hi. I try to do next math:

select extract( month from justify_days( timestamp '2016-01-31' +interval '1
month' -timestamp '2016-01-31') );date_part 
-----------        0
(1 row)

I expect `1` but get `0`. But here everything is right:

>Adjust interval so 30-day time periods are represented as months

https://www.postgresql.org/docs/9.6/static/functions-datetime.html

But with ability to setup justify date the math will be more sharp.

Please implement next feature:

select extract( month from justify_days( timestamp '2016-01-31' +interval '1
month' -timestamp '2016-01-31'), timestamp '2016-01-31' );date_part 
-----------        1
(1 row)

This is useful when I try to calculate how much month are left between
service start and end dates.

Thank you.


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