[MS SQL] Konwersja DATETIME z uwzględnieniem TIME ZONE

SELECT
 EventDT AT TIME ZONE 'Central European Standard Time' AT TIME ZONE 'UTC' AS LocalToUtc,
 EventDT AS UnkownZone,
 EventDT AT TIME ZONE 'UTC' AT TIME ZONE 'Central European Standard Time' AS UtcToLocal
FROM (
 SELECT CAST('2021-01-01 10:00:00' AS DATETIME) AS EventDT
 UNION ALL SELECT CAST('2021-03-01 10:00:00' AS DATETIME) AS EventDT
 UNION ALL SELECT CAST('2021-04-01 10:00:00' AS DATETIME) AS EventDT
 UNION ALL SELECT CAST('2021-09-01 10:00:00' AS DATETIME) AS EventDT
 UNION ALL SELECT CAST('2021-10-01 10:00:00' AS DATETIME) AS EventDT
 UNION ALL SELECT CAST('2021-12-01 10:00:00' AS DATETIME) AS EventDT
) AS Tmp