Date.commercial

(?::Integer cwyear, ?::Integer cweek, ?::Integer cwday, ?::Integer start) -> ::Date

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;
}

Returns a new Date object constructed from the arguments.

Argument cwyear gives the year, and should be an integer.

Argument cweek gives the index of the week within the year, and should be in range (1..53) or (-53..-1); in some years, 53 or -53 will be out-of-range; if negative, counts backward from the end of the year:

Example

Date.commercial(2022, 1, 1).to_s  # => "2022-01-03"
Date.commercial(2022, 52, 1).to_s # => "2022-12-26"

Argument cwday gives the indes of the weekday within the week, and should be in range (1..7) or (-7..-1); 1 or -7 is Monday; if negative, counts backward from the end of the week:

Example

Date.commercial(2022, 1, 1).to_s  # => "2022-01-03"
Date.commercial(2022, 1, -7).to_s # => "2022-01-03"

When cweek is 1:

If January 1 is a Friday, Saturday, or Sunday, the first week begins in the week after:

Example

Date::ABBR_DAYNAMES[Date.new(2023, 1, 1).wday] # => "Sun"
Date.commercial(2023, 1, 1).to_s # => "2023-01-02"
Date.commercial(2023, 1, 7).to_s # => "2023-01-08"

Otherwise, the first week is the week of January 1, which may mean some of the days fall on the year before:

Example

Date::ABBR_DAYNAMES[Date.new(2020, 1, 1).wday] # => "Wed"
Date.commercial(2020, 1, 1).to_s # => "2019-12-30"
Date.commercial(2020, 1, 7).to_s # => "2020-01-05"

See argument start.

See also .civil .gregorian_leap? ._httpdate also in 4.1 · 4.0 · 3.3 · 3.2 · 3.1 · 3.0

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