Issue #9809 has been updated by Andrew Vit.


This looks like correct behaviour. From a previous issue #9372:

A period of time of seven days within a calendar year, starting on a
Monday and identified by its ordinal number within the year; the first
calendar week of the year is the one that includes the first Thursday
of that year.

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Bug #9809: Date.new(2000,1,1).cweek should == 1
https://bugs.ruby-lang.org/issues/9809#change-46577

* Author: Ben Zhu
* Status: Open
* Priority: Normal
* Assignee: 
* Category: core
* Target version: 
* ruby -v: 2.1.1
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN
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I run `Date.new(2000,1,1).cweek`, the result is 52.

My Ruby version is 2.1.1



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