method

jd_to_civil

v1_8_7_330 - 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 418
  def self.jd_to_civil(jd, sg=GREGORIAN)
    if julian?(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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