public void GetTimeZoneInfo_UK_Input()
        {
            const string input  = "Europe/London";
            var          result = TimeSpanConverter.GetTimeZoneInfo(input);

            result.Should().Be(TZConvert.GetTimeZoneInfo("GMT Standard Time"));
        }
        public void GetTimeZoneInfo_Empty_Input()
        {
            const string input  = "";
            var          result = TimeSpanConverter.GetTimeZoneInfo(input);

            result.Should().Be(TimeZoneInfo.Utc);
        }
        private static DateTime GetDateTimeToUtc(DateTime time, string timezone)
        {
            var timeZoneInfo = TimeSpanConverter.GetTimeZoneInfo(timezone);

            return(TimeSpanConverter.ConvertTimeToUtcUsingTimeZone(time.TimeOfDay, timeZoneInfo));
        }