How to perform DateTime calculations in a right way

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How to perform DateTime calculations in a right way

published 1 year ago, submitted by Sirko 1 year ago

dotnettipoftheday.org — When coding, be careful if you need to perform DateTime calculations (add/subtract) on values representing time zones that practice daylight savings time.

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DateTime d;

d = DateTime.Parse("Oct 26, 2003 12:00:00 AM"); //date assignment

d = d.ToUniversalTime().AddHours(3.0).ToLocalTime();

//' - displays 10/26/2003 02:00:00 AM – Correct!

MessageBox.Show(d.ToString());
I thought that the correct result should be 3 a.m. not 2.a.m.
Am I missing something?

posted by dmihailescu 10 months, 18 days ago

Correct result is 2 a.m. because in 2003 daylight savings time ended at 2 a.m. October 26.
http://webexhibits.org/daylightsaving/b.html

posted by manovich 10 months, 11 days ago