Method: Date.jd

Defined in:
date_core.c

.jd(jd = 0, start = Date::ITALY) ⇒ Object

Returns a new Date object formed from the arguments:

Date.jd(2451944).to_s # => "2001-02-03"
Date.jd(2451945).to_s # => "2001-02-04"
Date.jd(0).to_s       # => "-4712-01-01"

The returned date is:

  • Gregorian, if the argument is greater than or equal to start:

    Date::ITALY                         # => 2299161
Date.jd(Date::ITALY).gregorian?     # => true
Date.jd(Date::ITALY + 1).gregorian? # => true

  • Julian, otherwise

    Date.jd(Date::ITALY - 1).julian?    # => true

See argument start.

Related: Date.new.



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# File 'date_core.c', line 3357

static VALUE
date_s_jd(int argc, VALUE *argv, VALUE klass)
{
    VALUE vjd, vsg, jd, fr, fr2, ret;
    double sg;

    rb_scan_args(argc, argv, "02", &vjd, &vsg);

    jd = INT2FIX(0);
    fr2 = INT2FIX(0);
    sg = DEFAULT_SG;

    switch (argc) {
      case 2:
  val2sg(vsg, sg);
      case 1:
        check_numeric(vjd, "jd");
  num2num_with_frac(jd, positive_inf);
    }

    {
  VALUE nth;
  int rjd;

  decode_jd(jd, &nth, &rjd);
  ret = d_simple_new_internal(klass,
            nth, rjd,
            sg,
            0, 0, 0,
            HAVE_JD);
    }
    add_frac();
    return ret;
}