[ruby-core:76536] [Ruby trunk Bug#12285] Date.iso8601 does not properly handle partial date strings

Issue #12285 has been updated by Martin D端rst.


There is some information about library maintainers e.g. at
https://bugs.ruby-lang.org/projects/ruby/wiki/MaintainersStdlib or
https://bugs.ruby-lang.org/projects/ruby/wiki/Contributors,
but these may not be up to date.

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Bug #12285: Date.iso8601 does not properly handle partial date strings
https://bugs.ruby-lang.org/issues/12285#change-59776

* Author: John Backus
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-darwin15]
* Backport: 2.1: REQUIRED, 2.2: REQUIRED, 2.3: REQUIRED
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> For reduced accuracy, any number of values may be dropped from any of the date and time representations, but in the order from the least to the most significant. For example, "2004-05" is a valid ISO 8601 date, which indicates May (the fifth month) 2004.

From https://en.wikipedia.org/wiki/ISO_8601#cite_ref-AccuracyVsPrecision_8-0

However if I parse this example value with `Date.iso8601` I get "January 5th, 2004" when I expect "May 1st, 2004":

```
$ irb -r date
2.3.0 :001 > date = Date.iso8601('2004-05')
 => #<Date: 2004-01-05 ((2453010j,0s,0n),+0s,2299161j)>
2.3.0 :002 > date.month
 => 1
 ```



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