CODEWITHSUNDEEP
c#.net-core
Gersalom
Gersalom

Reputation: 79

Create DateTime in specific time zone then convert to utc

I need to create a DateTime with a set date and time which will be in a specific time zone(West Asia Standard Time, W. Europe Standard Time etc).

DST must be preserved, so offset is out because for half of the year for a given time zone it will be for example +2h and for the other half +3h.

Then I want to convert the date to UTC.

I tried to do it in such a way that I could add this timezone offset later. However, firstly I do not like this solution and I am afraid that I will lose one hour when the time changes twice a year, and secondly I get an error:

"The UTC Offset for Utc DateTime instances must be 0."

var testTime = new DateTime(testDate.Year, testDate.Month, testDate.Day, 4, 0, 0, DateTimeKind.Utc);
var timeZoneInfo = TimeZoneInfo.FindSystemTimeZoneById("West Asia Standard Time");
var timezoneTime = TimeZoneInfo.ConvertTimeFromUtc(runTime, timeZoneInfo);
var offset = timeZoneInfo.GetUtcOffset(timezoneTime);

I would like to get this kind of code

var timeZoneInfo = TimeZoneInfo.FindSystemTimeZoneById("West Asia Standard Time");
var testTime = new DateTime(testDate.Year, testDate.Month, testDate.Day, 4, 0, 0, timeZoneInfo);
var utcTime = testTime.ToUniversalTime();

So, to sum up, I want to have method, where I pass year, month, day, hour, minute and timeZone and in return I will get DateTime that is in UTC In javascript there are libraries, where the given time zone is given as a parameter but I have to do it on the server side.

Upvotes: 4

Views: 1467

Answers (1)

Ivan Stoev
Ivan Stoev

Reputation: 205799

You'd basically need TimeZoneInfo.ConvertTimeToUtc method.

Just make sure the Kind property of the passed DateTime is Unspecified, otherwise the method has special expectations for the sourceTimeZone argument and will throw exception.

e.g.

var testTime = new DateTime(testDate.Year, testDate.Month, testDate.Day, 4, 0, 0);
var timeZoneInfo = TimeZoneInfo.FindSystemTimeZoneById("West Asia Standard Time");
var utcTime = TimeZoneInfo.ConvertTimeToUtc(testTime, timeZoneInfo);;

Upvotes: 8

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