Проектирование многомерного графика плотности в R

Вот метод расширения, который я использую.

/// <summary>
/// Converts a string to a dateTime with the given format and kind.
/// </summary>
/// <param name="dateTimeString">The date time string.</param>
/// <param name="dateTimeFormat">The date time format.</param>
/// <param name="dateTimeKind">Kind of the date time.</param>
/// <returns></returns>
public static DateTime ToDateTime(this string dateTimeString, string dateTimeFormat, DateTimeKind dateTimeKind)
{
    if (string.IsNullOrEmpty(dateTimeString))
    {
        return DateTime.MinValue;
    }

    DateTime dateTime;
    try
    {
        dateTime = DateTime.SpecifyKind(DateTime.ParseExact(dateTimeString, dateTimeFormat, CultureInfo.InvariantCulture), dateTimeKind);
    }
    catch (FormatException)
    {
        dateTime = DateTime.MinValue;
    }

    return dateTime;
}