[Mono-bugs] [Bug 541959] New: DateTime is incorrect during DST transition times

[bugzilla_noreply at novell.com]

http://bugzilla.novell.com/show_bug.cgi?id=541959


           Summary: DateTime is incorrect during DST transition times
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.4.x
          Platform: Other
        OS/Version: Ubuntu
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: System
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: tedu at fogcreek.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---


Created an attachment (id=319787)
 --> (http://bugzilla.novell.com/attachment.cgi?id=319787)
test case

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.12)
Gecko/20080207 Ubuntu/7.10 (gutsy) Firefox/2.0.0.12

During Daylight Savings transitions in the US Eastern timezone, the 2:00 to
3:00 hour disappears.  Mono is erasing the 1:00 to 2:00 hour instead.

Reproducible: Always

Steps to Reproduce:
using System;

class TimeTest {

        public static void Main() {
                testDate(Convert.ToDateTime("2007-03-11 06:00:00"));
                testDate(Convert.ToDateTime("2007-03-11 06:30:00"));
                testDate(Convert.ToDateTime("2007-03-11 07:00:00"));

        }

        private static void testDate(DateTime dt) {
                DateTime utc = dt.ToUniversalTime();

                utc = utc.AddHours(-4);
                Console.Write("UTC: " + utc);
                DateTime local = utc.ToLocalTime();

                Console.WriteLine(" --> Local: " + local);
        }
}       

Actual Results:  
UTC: 3/11/2007 6:00:00 AM --> Local: 3/11/2007 1:00:00 AM
UTC: 3/11/2007 6:30:00 AM --> Local: 3/11/2007 2:30:00 AM
UTC: 3/11/2007 7:00:00 AM --> Local: 3/11/2007 3:00:00 AM


Expected Results:  
UTC: 3/11/2007 6:00:00 AM --> Local: 3/11/2007 1:00:00 AM
UTC: 3/11/2007 6:30:00 AM --> Local: 3/11/2007 1:30:00 AM
UTC: 3/11/2007 7:00:00 AM --> Local: 3/11/2007 3:00:00 AM

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