Method: Time#round

Defined in:
time.c

#round(ndigits = 0) ⇒ Time

Returns a new Time object whose numeric value is that of self, with its seconds value rounded to precision ndigits:

t = Time.utc(2010, 3, 30, 5, 43, 25.123456789r)
t          # => 2010-03-30 05:43:25.123456789 UTC
t.round    # => 2010-03-30 05:43:25 UTC
t.round(0) # => 2010-03-30 05:43:25 UTC
t.round(1) # => 2010-03-30 05:43:25.1 UTC
t.round(2) # => 2010-03-30 05:43:25.12 UTC
t.round(3) # => 2010-03-30 05:43:25.123 UTC
t.round(4) # => 2010-03-30 05:43:25.1235 UTC

t = Time.utc(1999, 12,31, 23, 59, 59)
t                # => 1999-12-31 23:59:59 UTC
(t + 0.4).round  # => 1999-12-31 23:59:59 UTC
(t + 0.49).round # => 1999-12-31 23:59:59 UTC
(t + 0.5).round  # => 2000-01-01 00:00:00 UTC
(t + 1.4).round  # => 2000-01-01 00:00:00 UTC
(t + 1.49).round # => 2000-01-01 00:00:00 UTC
(t + 1.5).round  # => 2000-01-01 00:00:01 UTC

Related: Time#ceil, Time#floor.



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# File 'time.c', line 4557

static VALUE
time_round(int argc, VALUE *argv, VALUE time)
{
    VALUE ndigits, v, den;
    struct time_object *tobj;

    if (!rb_check_arity(argc, 0, 1) || NIL_P(ndigits = argv[0]))
        den = INT2FIX(1);
    else
        den = ndigits_denominator(ndigits);

    GetTimeval(time, tobj);
    v = w2v(rb_time_unmagnify(tobj->timew));

    v = modv(v, den);
    if (lt(v, quov(den, INT2FIX(2))))
        return time_add(tobj, time, v, -1);
    else
        return time_add(tobj, time, subv(den, v), 1);
}