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Asked: 2026-05-11T12:36:59+00:00

Start with three variables, all are System.DateTime. a: 10/2/2009 2:30:00 PM b: 10/2/2009 2:30:00

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Start with three variables, all are System.DateTime.

a: 10/2/2009 2:30:00 PM b: 10/2/2009 2:30:00 PM c: 10/2/2009 2:30:00 PM

Compare them to each other.

a=b: True b=c: True c=a: True

Ok, we have established that all three dates are equal. So when we convert them all to Universal time, we will get the same result. Right?

a.ToUniversalTime: 10/2/2009 9:30:00 PM b.ToUniversalTime: 10/2/2009 9:30:00 PM c.ToUniversalTime: 10/2/2009 2:30:00 PM

So what happened?

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1 Answer

  1. From http://msdn.microsoft.com/en-us/library/system.datetime.touniversaltime.aspx:

    Starting with the .NET Framework version 2.0, the value returned by the ToUniversalTime method is determined by the Kind property of the current DateTime object.

    • Kind == Utc – no conversion performed
    • Kind == Local or Unspecified – conversion is performed according to the local timezone
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