[Mono-bugs] [Bug 619811] New: TimeZoneInfo.ConvertTimeFromUtc throws a NullReferenceException for US/Hawaii timezone

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http://bugzilla.novell.com/show_bug.cgi?id=619811

http://bugzilla.novell.com/show_bug.cgi?id=619811#c0


           Summary: TimeZoneInfo.ConvertTimeFromUtc throws a
                    NullReferenceException for US/Hawaii timezone
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.4.x
          Platform: 64bit
        OS/Version: UNIX Other
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: System
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: graham.wagener at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---


User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US)
AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.86 Safari/533.4

I get the following exception and truncated stack trace when calling
ConvertTimeFromUtc with destinationTimeZone of "US/Hawaii".

TimeZoneInfo hawaiiTZI = TimeZoneInfo.FindSystemTimeZoneById("US/Hawaii");
DateTime gmt = new DateTime(...);
DateTime local = TimeZoneInfo(gmt, hawaiiTZI);

Unhandled Exception: System.NullReferenceException: Object reference not set to
an instance of an object
  at System.TimeZoneInfo.GetApplicableRule (DateTime dateTime) [0x00000]
  at System.TimeZoneInfo.ConvertTimeFromUtc (DateTime dateTime) [0x00000]
  at System.TimeZoneInfo.ConvertTimeFromUtc (DateTime dateTime,
System.TimeZoneInfo destinationTimeZone) [0x00000]

Hawaii does not observe Daylight Savings Time so hawaiiTZI.GetAdjustmentRules()
returns an empty array or possibly null, which presumably leads to the NRE in
GetApplicableRule.

A workaround and example of related code that does work is using GetUtcOffset. 
On Windows under .NET the following returns the same value as
ConvertTimeFromUtc and does not throw an exception in mono:

DateTime local = gmt + hawaiiTZI.GetUtcOffset(gmt);

Reproducible: Always

Steps to Reproduce:
see code in description
Actual Results:  
exception

Expected Results:  
no exception

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