[ruby-core:84171] [Ruby trunk Bug#12285] Date.iso8601 does not properly handle partial date strings

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Issue #12285 has been updated by jonwolski (Jon Wolski).

File iso8601_YYYY_MM.patch added

I had submitted a patch to an issue that got marked as a 'duplicate' (though it is still "open"). My ticket is not "assigned," so maybe it would help to add the patch here as well. Also, the corresponding pull-request on GitHub is https://github.com/ruby/ruby/pull/1463

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Bug #12285: Date.iso8601 does not properly handle partial date strings
https://bugs.ruby-lang.org/issues/12285#change-68281

* Author: backus (John Backus)
* Status: Assigned
* Priority: Normal
* Assignee: tadf (tadayoshi funaba)
* Target version: 
* 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
 ```

---Files--------------------------------
iso8601_YYYY_MM.patch (1.39 KB)


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