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I came across a weired problem with the LocalTimeToUTC/UTCToLocalTime functions of the TimeZone class (C#, CSOM v14.0.4762.1000).

The results are just completely wrong. I couldn't find any other page about this error, so here is what I got:

// definition of site and clientContext are omitted
Microsoft.SharePoint.Client.TimeZone timeZone = site.RegionalSettings.TimeZone;
clientContext.Load(timeZone);
clientContext.ExecuteQuery();

At this point timeZone.Description equals to "(UTC+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna", which is correct in my case. When I issue the following lines however, which both are supposed to equal to the current UTC time, the results are not equal at all.

DateTime utc1 = timeZone.LocalTimeToUTC(DateTime.Now).Value; // 01/01/0001 00:00:00
DateTime utc2 = DateTime.UtcNow;                             // 14/06/2018 21:30:56

The value of utc1 just makes no sense at all. I've checked that DateTime.Now gives the correct input, which it does. LocalTimeToUTC is explicitly taking System.DateTime [1].

With UTCToLocalTime I'm getting the same issues.

Does anybody know what's going wrong? Is it me or is it Microsoft?

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