woDigits(day);
  String h = _twoDigits(hour);
  String min = _twoDigits(minute);
  String sec = _twoDigits(second);
  String ms = _threeDigits(millisecond);
  String us = microsecond == 0 ? &quot;&quot; : _threeDigits(microsecond);
  if (isUtc) {
    return &quot;$y-$m-$d $h:$min:$sec.$ms${us}Z&quot;;
  } else {
    return &quot;$y-$m-$d $h:$min:$sec.$ms$us&quot;;
  }
}</code></pre>
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