[Mono-bugs] [Bug 345057] New: DateTime unspecified-to-localtime conversions different between mono and . net

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https://bugzilla.novell.com/show_bug.cgi?id=345057

           Summary: DateTime unspecified-to-localtime conversions different
                    between mono and .net
           Product: Mono: Class Libraries
           Version: 1.2.5
          Platform: x86
        OS/Version: Ubuntu
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Sys.Core
        AssignedTo: mono-bugs at ximian.com
        ReportedBy: apenwarr at versabanq.com
         QAContact: mono-bugs at ximian.com
          Found By: Development


I tried the following program in Microsoft .NET 2.0 and 3.5 (same
results both times) and mono 1.2.3 and 1.2.5 (same results both
times).

I see two main differences here:

1) Dates after the Y2.038k bug in 2038 do not calculate daylight
savings time correctly.

2) DateTime.Parse in .NET seems to return a timezone-unspecified
DateTime, such that converting it ToLocalTime() or ToUniversalTime()
will always change the timestamp in one direction or the other.  In
mono, it seems to be a timezone-localtime DateTime, so that
ToLocalTime() has no effect.




Source code:

 using System;

 public static class Test
 {
   public static void test(DateTime dt)
   {
       System.Console.WriteLine("{0} -- {1}",
                dt.ToLocalTime(), dt.ToUniversalTime());
       System.Console.WriteLine("   {0} -- {1} -- {2}",
                dt.Ticks, dt.ToLocalTime().Ticks, dt.ToUniversalTime().Ticks);
   }

   public static void Main()
   {
       test(DateTime.Parse("2007-09-27 5:14:14"));
       test(DateTime.Parse("2007-11-27 5:14:14"));
       test(DateTime.Parse("2039-09-27 5:14:14"));
       test(DateTime.Parse("2039-11-27 5:14:14"));
       test(DateTime.Parse("0001-01-01 10:01:02"));
   }
 }


Results in .NET:

9-27-2007 1:14:14 AM -- 9-27-2007 9:14:14 AM
  633264668540000000 -- 633264524540000000 -- 633264812540000000
11-27-2007 12:14:14 AM -- 11-27-2007 10:14:14 AM
  633317372540000000 -- 633317192540000000 -- 633317552540000000
9-27-2039 1:14:14 AM -- 9-27-2039 9:14:14 AM
  643363100540000000 -- 643362956540000000 -- 643363244540000000
11-27-2039 12:14:14 AM -- 11-27-2039 10:14:14 AM
  643415804540000000 -- 643415624540000000 -- 643415984540000000
1-1-0001 5:01:02 AM -- 1-1-0001 3:01:02 PM
  360620000000 -- 180620000000 -- 540620000000


Results in mono:

27/09/2007 5:14:14 AM -- 27/09/2007 9:14:14 AM
  633264668540000000 -- 633264668540000000 -- 633264812540000000
27/11/2007 5:14:14 AM -- 27/11/2007 10:14:14 AM
  633317372540000000 -- 633317372540000000 -- 633317552540000000
27/09/2039 5:14:14 AM -- 27/09/2039 10:14:14 AM
  643363100540000000 -- 643363100540000000 -- 643363280540000000
27/11/2039 5:14:14 AM -- 27/11/2039 10:14:14 AM
  643415804540000000 -- 643415804540000000 -- 643415984540000000
01/01/0001 10:01:02 AM -- 01/01/0001 3:01:02 PM
  360620000000 -- 360620000000 -- 540620000000


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