instance method

Date#===

(::Date other) -> bool

self === other → true, false, or nil.

static VALUE
d_lite_equal(VALUE self, VALUE other)
{
    if (!k_date_p(other))
        return equal_gen(self, other);

    {
        get_d2(self, other);

        if (!(m_gregorian_p(adat) == m_gregorian_p(bdat)))
            return equal_gen(self, other);

        {
            VALUE a_nth, b_nth;
            int a_jd, b_jd;

            m_canonicalize_jd(self, adat);
            m_canonicalize_jd(other, bdat);
            a_nth = m_nth(adat);
            b_nth = m_nth(bdat);
            a_jd = m_local_jd(adat);
            b_jd = m_local_jd(bdat);
            if (f_eqeq_p(a_nth, b_nth) &&
                a_jd == b_jd)
                return Qtrue;
            return Qfalse;
        }
    }
}

Returns true if self and other represent the same date, false if not, nil if the two are not comparable.

Argument other may be:

Another Date object:

Example

d = Date.new(2022, 7, 27) # => #<Date: 2022-07-27 ((2459788j,0s,0n),+0s,2299161j)>
prev_date = d.prev_day    # => #<Date: 2022-07-26 ((2459787j,0s,0n),+0s,2299161j)>
next_date = d.next_day    # => #<Date: 2022-07-28 ((2459789j,0s,0n),+0s,2299161j)>
d === prev_date           # => false
d === d                   # => true
d === next_date           # => false

A DateTime object:

Example

d === DateTime.new(2022, 7, 26) # => false
d === DateTime.new(2022, 7, 27) # => true
d === DateTime.new(2022, 7, 28) # => false

A numeric (compares self.jd to other):

Example

d === 2459788 # => true
d === 2459787 # => false
d === 2459786 # => false
d === d.jd    # => true

An object not comparable:

Example
```
d === Object.new # => nil
```

See also #<=> #>> #<< #ajd also in 4.1 · 3.4 · 3.3 · 3.2 · 3.1 · 3.0

‹ prev#<=> next ›#>>