Method: Date#-

Defined in:
date_core.c

#-(other) ⇒ Object

If the other is a date object, returns a Rational whose value is the difference between the two dates in days. If the other is a numeric value, returns a date object pointing other days before self. If the other is a fractional number, assumes its precision is at most nanosecond.

Date.new(2001,2,3) - 1  #=> #<Date: 2001-02-02 ...>
DateTime.new(2001,2,3) - Rational(1,2)

#=> #<DateTime: 2001-02-02T12:00:00+00:00 …>

Date.new(2001,2,3) - Date.new(2001)

#=> (33/1)

DateTime.new(2001,2,3) - DateTime.new(2001,2,2,12)

#=> (1/2)



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# File 'date_core.c', line 6343

static VALUE
d_lite_minus(VALUE self, VALUE other)
{
    if (k_date_p(other))
  return minus_dd(self, other);

    switch (TYPE(other)) {
      case T_FIXNUM:
  return d_lite_plus(self, LONG2NUM(-FIX2LONG(other)));
      case T_FLOAT:
  return d_lite_plus(self, DBL2NUM(-RFLOAT_VALUE(other)));
      default:
  expect_numeric(other);
  /* fall through */
      case T_BIGNUM:
      case T_RATIONAL:
  return d_lite_plus(self, f_negate(other));
    }
}