Module: JPDate::Era

Defined in:
lib/jpdate/era.rb

Constant Summary collapse

ERAS = 
[
  ['1868-10-23', '1912-07-30', '明治', :M],
  ['1912-07-30', '1926-12-25', '大正', :T],
  ['1926-12-25', '1989-01-07', '昭和', :S],
  ['1989-01-08', '2019-04-30', '平成', :H],
  ['2019-05-01', '9999-12-31', 'ＸＸ', :X],
]

Class Method Summary collapse

Class Method Details

.name_year(y, m = nil, d = nil, format: '%s%d年', human: true, short: false) ⇒ Object

和暦の元号と年を返す

Example:

JPDate::Era.name_year(2014)                       # => ["平成26年"]
JPDate::Era.name_year(1926)                       # => ["大正15年", "昭和元年"]
JPDate::Era.name_year(1926, 11)                   # => ["大正15年"]
JPDate::Era.name_year(1926, 12)                   # => ["大正15年", "昭和元年"]
JPDate::Era.name_year(1926, 12, 24)               # => ["大正15年"]
JPDate::Era.name_year(1926, 12, 25)               # => ["大正15年", "昭和元年"]
JPDate::Era.name_year(1926, 12, 26)               # => ["昭和元年"]
JPDate::Era.name_year(1926, 12, 26, human: false) # => ["昭和1年"]
JPDate::Era.name_year(1927, format: '%s%02d年')   # => ["昭和02年"]



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# File 'lib/jpdate/era.rb', line 27

def name_year(y, m=nil, d=nil, format: '%s%d年', human: true, short: false)
  dates = [Date.new(y, m ||  1, d ||  1), Date.new(y, m || -1, d || -1)]
  eras = ERAS.select do |era_s, era_e|
    (0..1).inject(false) {|t, i| t || Date.parse(era_s) <= dates[i] && dates[i] <= Date.parse(era_e)}
  end
  eras.map do |s, e, v, initial|
    era_year = y - Date.parse(s).year + 1
    res = sprintf(format, short ? initial : v, era_year)
    human ? res.sub(/(\D+)0*1(\D+|$)/, '\1元\2') : res
  end
end

.short_name_year(y, m = nil, d = nil) ⇒ Object

和暦のアルファベットの元号と年を返す

Example:

JPDate::Era.short_name_year(2014)                 # => ["H26"]
JPDate::Era.short_name_year(1926)                 # => ["T15", "S01"]



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# File 'lib/jpdate/era.rb', line 43

def short_name_year(y, m=nil, d=nil)
  name_year(y, m, d, format: '%s%02d', human: false, short: true)
end