TimeOnlyConverter for System.Text.Json in .NET 6.0

TimeOnlyConverter.cs

public class TimeOnlyConverter : JsonConverter<TimeOnly>
{
    private readonly string serializationFormat;

    public TimeOnlyConverter() : this(null)
    {
    }

    public TimeOnlyConverter(string? serializationFormat)
    {
        this.serializationFormat = serializationFormat ?? "HH:mm:ss.fff";
    }

    public override TimeOnly Read(ref Utf8JsonReader reader, 
                            Type typeToConvert, JsonSerializerOptions options)
    {
        var value = reader.GetString();
        return TimeOnly.Parse(value!);
    }

    public override void Write(Utf8JsonWriter writer, TimeOnly value, 
                                        JsonSerializerOptions options)
        => writer.WriteStringValue(value.ToString(serializationFormat));
}

Thank you for this! This and DateOnlyConverter worked perfectly.