method

jd_to_civil

v1_9_1_378 - Show latest stable - Class: Date

jd_to_civil(jd, sg=GREGORIAN)

public

Convert a Julian Day Number to a Civil Date. jd is the Julian Day Number. sg specifies the Day of Calendar Reform.

Returns the corresponding [year, month, day_of_month] as a three-element array.

# File lib/date.rb, line 417
    def jd_to_civil(jd, sg=GREGORIAN) # :nodoc:
      if jd < sg
        a = jd
      else
        x = ((jd - 1867216.25) / 36524.25).floor
        a = jd + 1 + x - (x / 4.0).floor
      end
      b = a + 1524
      c = ((b - 122.1) / 365.25).floor
      d = (365.25 * c).floor
      e = ((b - d) / 30.6001).floor
      dom = b - d - (30.6001 * e).floor
      if e <= 13
        m = e - 1
        y = c - 4716
      else
        m = e - 13
        y = c - 4715
      end
      return y, m, dom
    end

jd_to_civil

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