#[derive(Serialize, Deserialize)]
pub struct Elements<T>(HashMap<DateTime<Utc>, T>)

#[derive(Serialize, Deserialize)]
pub struct Elements<T>(HashMap<DateTime<Utc>, T>)

public class Elements<T>
{
    public Dictionary<DateTime, T> Values { get; set; }

    public Elements(Dictionary<DateTime, T> values)
    {
        Values = values;
    }

    public static Elements<T> NewTest(string isoDateString, T firstValue)
    {
        DateTime parsedDate = DateTime.Parse(isoDateString);
        Dictionary<DateTime, T> values = new Dictionary<DateTime, T>
        {
            { parsedDate, firstValue }
        };
        return new Elements<T>(values);
    }
}

public class Elements<T>
{
    public Dictionary<DateTime, T> Values { get; set; }

    public Elements(Dictionary<DateTime, T> values)
    {
        Values = values;
    }

    public static Elements<T> NewTest(string isoDateString, T firstValue)
    {
        DateTime parsedDate = DateTime.Parse(isoDateString);
        Dictionary<DateTime, T> values = new Dictionary<DateTime, T>
        {
            { parsedDate, firstValue }
        };
        return new Elements<T>(values);
    }
}