'Check a date (datetime) if it is Daylight Saving Time with unknown region - c#

With what I understood from other questions I've used below code for checking a date if it is Daylight saving time and altering as required. I do not know which region would the application be used hence I am using Utc. However it is not working as expected.

DateTime dateValWithOffset = dateVal;
TimeZoneInfo timeZoneInfo = TimeZoneInfo.Utc;

if(timeZoneInfo.IsDaylightSavingTime(dateValWithOffset))
{
 dateValWithOffset = dateValWithOffset.AddMinutes(60);
}

Example: for sample date (06-JUL-21 06.16.34.547000000 AM) above code should be showing dateValWithOffset as 07/06/2021 02:16:34.547 AM but it returns 07/06/2021 01:16:34.547 AM . If someone can point out where am I going wrong please.

c++sharpdatetimetimezonedst


Solution 1:[1]

As jason.kaisersmith said in comments, "UTC is universal, so there is no daylight saving."

To elaborate, UTC does not have any daylight saving time. Instead, daylight saving time is observed differently at each time zone across the world. Some time zones don't use it at all. Some time zones start and stop DST at different dates or times than other time zones. There's even one time zone that shifts for DST by 30 minutes instead of the usual 1 hour. Without a time zone reference, the concept of DST is meaningless.

For clarity and reference, here's an overview of anticipated DST dates for 2022 by country, and a detailed list of dates and times for the first half and second half of 2022.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Matt Johnson-Pint

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