From: nobu@... Date: 2019-04-02T06:25:28+00:00 Subject: [ruby-core:92102] [Ruby trunk Feature#15742] Add Date#jisx0301 support new Japanese era Issue #15742 has been updated by nobu (Nobuyoshi Nakada). akr (Akira Tanaka) wrote: > I think no-era representation is similar to truncation of ISO 8601:2000. > "truncation" provides a way to omit higher order component by mutual agreement: > describe the year 1985 as 85 for example. > (See Wikipedia https://en.wikipedia.org/wiki/ISO_8601#Truncated_representations ) It reminds me the second parameter to `Time.parse`: > We can change the date used to infer our missing elements by passing a > second object that responds to #mon, #day and #year, such as Date, Time > or DateTime. > Apart from that, "truncation" is removed at ISO 8601:2004. Good to know it. > So, it is reasonable to consider no-era representation as legacy feature. > (I don't know the future version of JIS X 0301, though.) Maybe, we should await next JIS X 0301? > My idea: > - Document `Date.jisx0301` interpret no-era representation as Heisei. > This is appropriate because it is a legacy feature. > And this is compatible as current version. > - Support "R" for Reiwa. > I think the initial letter R is almost fixed and no-one lose with it. Patches updated. ---------------------------------------- Feature #15742: Add Date#jisx0301 support new Japanese era https://bugs.ruby-lang.org/issues/15742#change-77429 * Author: kaishuu0123 (Koki Oyatsu) * Status: Feedback * Priority: Normal * Assignee: * Target version: ---------------------------------------- ## Reproduce process ``` irb(main):002:0> require 'date' => true irb(main):003:0> Date.new(2019, 5, 1).jisx0301 => "H31.05.01" ``` * ruby version: trunk ## Result of reproduce process ``` irb(main):003:0> Date.new(2019, 5, 1).jisx0301 => "H31.05.01" ``` ## Expected result and the reason why you expect ``` irb(main):002:0> require 'date' => true irb(main):003:0> Date.new(2019, 5, 1).jisx0301 => "R01.05.01" ``` ### reason * new era (Reiwa?) starts from 2019/05/01 * refs: https://github.com/ruby/ruby/blob/trunk/ext/date/date_core.c#L7049 * I can't be sure that initial letter is "R". -- https://bugs.ruby-lang.org/ Unsubscribe: