End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
DateTime#iso8601
dt.iso8601([n=0]) → string
ext/date/date_core.c
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static VALUE
dt_lite_iso8601(int argc, VALUE *argv, VALUE self)
{
long n = 0;
rb_check_arity(argc, 0, 1);
if (argc >= 1)
n = NUM2LONG(argv[0]);
return rb_str_append(strftimev("%Y-%m-%d", self, set_tmx),
iso8601_timediv(self, n));
}
This method is equivalent to strftime(‘%FT%T%:z’). The optional argument n is the number of digits for fractional seconds.
Example
DateTime.parse('2001-02-03T04:05:06.123456789+07:00').iso8601(9) #=> "2001-02-03T04:05:06.123456789+07:00"