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class method

Date.commercial

Date.commercial([cwyear=-4712[, cweek=1[, cwday=1[, start=Date::ITALY]]]]) → date

static VALUE
date_s_commercial(int argc, VALUE *argv, VALUE klass)
{
    VALUE vy, vw, vd, vsg, y, fr, fr2, ret;
    int w, d;
    double sg;

    rb_scan_args(argc, argv, "04", &vy, &vw, &vd, &vsg);

    y = INT2FIX(-4712);
    w = 1;
    d = 1;
    fr2 = INT2FIX(0);
    sg = DEFAULT_SG;

    switch (argc) {
      case 4:
        val2sg(vsg, sg);
      case 3:
        check_numeric(vd, "cwday");
        num2int_with_frac(d, positive_inf);
      case 2:
        check_numeric(vw, "cweek");
        w = NUM2INT(vw);
      case 1:
        check_numeric(vy, "year");
        y = vy;
    }

    {
        VALUE nth;
        int ry, rw, rd, rjd, ns;

        if (!valid_commercial_p(y, w, d, sg,
                                &nth, &ry,
                                &rw, &rd, &rjd,
                                &ns))
            rb_raise(eDateError, "invalid date");

        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 week date.

The week and the day of week should be a negative or a positive number (as a relative week/day from the end of year/week when negative). They should not be zero.

Example

Date.commercial(2001)     #=> #<Date: 2001-01-01 ...>
Date.commercial(2002)     #=> #<Date: 2001-12-31 ...>
Date.commercial(2001,5,6) #=> #<Date: 2001-02-03 ...>