What's wrong with this date behavior in C#?

Posted by Jane McDowell on Stack Overflow See other posts from Stack Overflow or by Jane McDowell
Published on 2010-04-15T14:35:58Z Indexed on 2010/04/15 14:43 UTC
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If I output a formatted date as follows:

DateTime.Parse("2010-06-02T15:26:37.789 +01:00").ToString("HH:mm:sszzz")

I get the expected result:

15:26:37+01:00

However, if I parse the same date, convert to UTC and output with the same format as follows:

DateTime.Parse("2010-06-02T15:26:37.789 +01:00").ToUniversalTime().ToString("HH:mm:sszzz")

I get this:

14:26:37+01:00

Now those two dates, the local and UTC versions, should be exactly the same but the outputted text represents two different times.

Why is this?

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