UTC DateTime to Local and Back gives incorrect time

Question

I need to be able to convert UTC time to Local Time, add one hour and would like to convert back to UTC for comparison. However, the basic to TimeZone and back to UTC gives incorrect time.

DateTime utcDateTime = DateTime.SpecifyKind(DateTime.UtcNow, DateTimeKind.Utc);
var localTime = utcDateTime.ToZone("Central Time (US & Canada)"); // CORRECT TIME

// INCORRECT when converted back to utc. It should be the same as utcDateTime
var convertedBack = TimeZoneInfo.ConvertTimeToUtc(localTime); 

What am I missing?

Answer 1

// This works
TimeZoneInfo tz = TimeZoneInfo.FindSystemTimeZoneById("Central Standard Time");
var convertedBack =TimeZoneInfo.ConvertTimeToUtc(localTime, tz);