[BUGS] BUG #14527: Calandar Week

The following bug has been logged on the website:

Bug reference:      14527
Logged by:          John Cantin
Email address:      jcantin@strategicfuse.com
PostgreSQL version: 9.3.6
Operating system:   centos 7
Description:

Postgres seems to define calendar week differently depending on the function
called.

The extract function shows '2017-1-1' as week 52 but the to_char function
shows it as 1

select extract('week' from '2017-1-1'::date) as week

select to_char('2017-1-1'::date,'ww')


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