End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

class method

Date.jd

Date.jd([jd=0[, start=Date::ITALY]]) → date

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;
}

Creates a date object denoting the given chronological Julian day number.

Example

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