private bool IsPreviousDateErlierThanNow(Rate previousRate)
        {
            var date = _localSettings.TryGetValue(previousRate.Name, "date");

            if (string.IsNullOrEmpty(date))
            {
                return(false);
            }

            var previousDate = DateTime.Parse(date);

            return(previousDate.DayOfYear < DateTime.Now.DayOfYear);
        }