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era_ja
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Convert to Japanese era
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README.md
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era_ja
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# EraJa [](https://travis-ci.org/tomiacannondale/era_ja) Convert to Japanese era. ## Installation Add this line to your application's Gemfile: gem 'era_ja' And then execute: $ bundle Or install it yourself as: $ gem install era_ja ### ruby version ### See [.travis.yml](https://github.com/tomiacannondale/era_ja/blob/master/.travis.yml ) **NOTE** :: era_ja does not support ruby 1.9.3 since 0.4.0 ## Usage ### format string strftime format string can be used as an argument. Extra format strings provided by EraJa#to_era are: * %o: era(alphabet) * %O: era(kanzi) * %1O: era(single kanzi) * %E: era year * %-E: era year(single digit format from 1 to 9) * %K: era year(kanzi numeral) After the second year, make it a numeral * %J: kanzi numeral ### Time instance to Japanese era ```ruby require 'era_ja' Time.mktime(2012,4,29).to_era # => "H24.04.29" Time.mktime(2012,4,29).to_era("%O%E年%-m月%d日") # => "平成24年4月29日" Time.mktime(2012,4,29).to_era("%O%JE年%Jm月%Jd日") # => "平成二十四年四月二十九日" ``` ### Date instance to Japanese era ```ruby require 'era_ja' Date.new(2012,4,29).to_era # => "H24.04.29" Date.new(2012,4,29).to_era("%O%E年%-m月%d日") # => "平成24年4月29日" Date.new(2012,4,29).to_era("%O%JE年%Jm月%Jd日") # => "平成二十四年四月二十九日" ``` ### Convert numerals to kanzi ### ```ruby Time.mktime(2012,4,29).to_era("%JY年%Jm月%Jd日") # => "二千十二年四月二十九日" Date.new(2012,4,29).to_era("%JY年%Jm月%Jd日") # => "二千十二年四月二十九日" ``` The first year to be `元` and the second and subsequent years to be numbers, you can use `%K`. ```ruby Time.mktime(2019,5,1).to_era("%O%KE年%m月%d日") # => "令和元年05月01日" Time.mktime(2020,5,1).to_era("%O%KE年%m月%d日") # => "令和02年05月01日" Date.new(2019,5,1).to_era("%O%KE年%m月%d日") # => "令和元年05月01日" Date.new(2020,5,1).to_era("%O%KE年%m月%d日") # => "令和02年05月01日" ``` ### Era names ### To convert to single kanji era strings, you can use `%1O`. ```ruby require 'era_ja' Time.mktime(2012,4,29).to_era("%1O%E年%m月%d日") # => "平24年4月29日" ``` To convert to custom era strings, you can set `era_names` . ```ruby require 'era_ja' Time.mktime(2012,4,29).to_era(era_names: { heisei: ['h', '平'] }) # => "h24.04.29" Time.mktime(2012,4,29).to_era("%O%E年%-m月%d日", era_names: { heisei: ['h', '平'] }) # => "平24年4月29日" Time.mktime(2012,4,29).to_era("%O%JE年%Jm月%Jd日", era_names: { heisei: ['h', '平'] }) # => "平二十四年四月二十九日" # same as Date ``` ### Checking a date is convertible ### You can use `era_convertible?` to check if a given date is convertible or not. ```ruby require 'era_ja' Time.mktime(1868,9,7).era_convertible? #=> false Time.mktime(1868,9,8).era_convertible? #=> true ``` See [Note](#note) section for more details. ## Support Report issues and feature requests to github Issues. https://github.com/tomiacannondale/era_ja/issues ## Contributing 1. Fork it 2. Create your feature branch (`git checkout -b my-new-feature`) 3. Commit your changes (`git commit -am 'Added some feature'`) 4. Push to the branch (`git push origin my-new-feature`) 5. Create a new Pull Request ## Note The following issues exist regarding era: * The Meiji era starts at September 8, 1866, but that date is in the old Japanese lunar calendar. * The start dates of the Taisho and Showa eras are the same as the end dates of the Meiji and Taisho eras respectively. * [昭和ト改元](http://ja.wikisource.org/wiki/%e6%98%ad%e5%92%8c%e3%83%88%e6%94%b9%e5%85%83) * [大正十五年十二月ニ十五日以後ヲ改メテ昭和元年ト爲ス](http://ja.wikisource.org/wiki/%e5%a4%a7%e6%ad%a3%e5%8d%81%e4%ba%94%e5%b9%b4%e5%8d%81%e4%ba%8c%e6%9c%88%e3%83%8b%e5%8d%81%e4%ba%94%e6%97%a5%e4%bb%a5%e5%be%8c%e3%83%b2%e6%94%b9%e3%83%a1%e3%83%86%e6%98%ad%e5%92%8c%e5%85%83%e5%b9%b4%e3%83%88%e7%88%b2%e3%82%b9) * [明治45年（1912）7月｜大正と改元：日本のあゆみ](http://www.archives.go.jp/ayumi/kobetsu/m45_1912_01.html) ## Author tomi tomiacannondale@gmail.com ## License MIT License. For more information, please see LICENSE.
