IonTextWriterBuilder write timestamp fails

[simonz-bq]

Original issue opened by @jairveder in the QLDB-Driver repo. Moving it here as it's an Ion issue.

When using the IonTextWriterBuilder with IonTextOptions { TimestampAsMillis = false } writing of timestamps result in an System.FormatException.

Example code

{
using (var tw = new StringWriter())
using (var writer = IonTextWriterBuilder.Build(tw, new IonTextOptions { TimestampAsMillis = false }))
{
writer.Flush();
writer.StepIn(IonType.Struct);

      writer.SetFieldName("exampleDate");
      writer.WriteTimestamp(new Timestamp(exampleDate));

      writer.StepOut();
      writer.Finish();
  
      command = tw.ToString();
  }
  
  var result = IonLoader.Default.Load(command);

}
Executing this results in the following exception:
image

Package version: 1.0.1