CSharp/C#, Timezones - who can answer this

Timezones - who can answer this

Author	Message
Dave #1 / 9	Timezones - who can answer this I need to convert times between various timezones.... however it seems like all of the TimeZone functions only deal with the time zone of the PC. Why is the TimeZone class abstract? Do i have to basically make my own class and inherit from TimeZone to implement the functionality I need?
Sat, 27 Mar 2004 06:34:16 GMT

NETMaste #2 / 9	Timezones - who can answer this Unfortunately, Windows and .NET only have a concept of one single, current system-wide time-zone... (= .NET internal 'CurrentSystemTimeZone' class) For WIN32: even the function SystemTimeToTzSpecificLocalTime() is not on Win9x, only on NT, and reverse TzSpecificLocalTimeToSystemTime() was just introduced for Windows XP! You may have to workaround: - get zone information (TZI) from registry (MS KB Q115231) - manualy add offsets to UTC times... (e.g. MS KB Q128126) also read the 'ClockRack' article by Charles Petzold: http://www.pcmag.com/article/0,2997,s%253D1478%2526a%253D4914,00.asp and java has (as for the new J#.NET) SimpleTimeZone class derived from TimeZone NETMaster http://www.cetus-links.org/oo_CSharp.html Quote: > I need to convert times between various timezones.... however it seems like > all of the TimeZone functions only deal with the time zone of the PC. > Why is the TimeZone class abstract? Do i have to basically make my own > class and inherit from TimeZone to implement the functionality I need?
Sat, 27 Mar 2004 18:19:37 GMT

Dave #3 / 9	Timezones - who can answer this Quote: > Unfortunately, Windows and .NET only have a concept > of one single, current system-wide time-zone... Thanks for confirming what I was thinking. This really is a hole in the .NET libraries. I am creating my own class to handle arbitrary time zone conversions. It's not that difficult but it shouldn't have to be done in the first place!
Tue, 30 Mar 2004 01:56:24 GMT

Dave #4 / 9	Timezones - who can answer this Quote: > and java has (as for the new J#.NET) > SimpleTimeZone class derived from TimeZone Are you saying that J# will have a SimpleTimezone class? MICROSOFT: WHY DIDN'T YOU IMPLEMENT A CONCRETE TIME ZONE CLASS IN THE .NET LIBRARIES??? The abstract TimeZone class is virtually worthless as is. Does anyone know about 3rd party libraries for doing time zone conversions?
Tue, 30 Mar 2004 04:54:55 GMT

michk #5 / 9	Timezones - who can answer this Quote: > MICROSOFT: WHY DIDN'T YOU IMPLEMENT A CONCRETE TIME ZONE CLASS IN THE .NET > LIBRARIES??? The abstract TimeZone class is virtually worthless as is. UM, worthless to YOU because of what you want. That does not make it worthless for others. The same way my bicycle is worthless to get people from here to Sweden -- but very useful to ride around here? Or the way that 777-300 is useless to get me to the grocery store? You might want to choose your words with a bit more care.... -- MichKa Michael Kaplan (principal developer of the MSLU) Trigeminal Software, Inc. -- http://www.trigeminal.com/ the book -- http://www.i18nWithVB.com/
Tue, 30 Mar 2004 05:30:21 GMT

Jonathan Alle #6 / 9	Timezones - who can answer this There should have been a method that returns all the Time Zones that the computer knows about. Just as it can return a list of Fonts or Printers. -- Jonathan Allen Quote: > Unfortunately, Windows and .NET only have a concept > of one single, current system-wide time-zone... > (= .NET internal 'CurrentSystemTimeZone' class) > For WIN32: > even the function > SystemTimeToTzSpecificLocalTime() > is not on Win9x, only on NT, and reverse > TzSpecificLocalTimeToSystemTime() > was just introduced for Windows XP! > You may have to workaround: > - get zone information (TZI) from registry > (MS KB Q115231) > - manualy add offsets to UTC times... > (e.g. MS KB Q128126) > also read the 'ClockRack' article by Charles Petzold: > http://www.pcmag.com/article/0,2997,s%253D1478%2526a%253D4914,00.asp > and java has (as for the new J#.NET) > SimpleTimeZone class derived from TimeZone > NETMaster > http://www.cetus-links.org/oo_csharp.html - Hide quoted text - - Show quoted text - Quote: > > I need to convert times between various timezones.... however it seems like > > all of the TimeZone functions only deal with the time zone of the PC. > > Why is the TimeZone class abstract? Do i have to basically make my own > > class and inherit from TimeZone to implement the functionality I need?
Tue, 30 Mar 2004 07:07:10 GMT

michk #7 / 9	Timezones - who can answer this That is an opinion. But the priority of the first version was obviously to give the functionality of Win32 to the managed world. Future versions will undoubtably expand on it.... but I would not ecxpect time zones to be a terribly visible feature that would be expected to "jump the tracks" and get done earlier? -- MichKa Michael Kaplan (principal developer of the MSLU) Trigeminal Software, Inc. -- http://www.trigeminal.com/ the book -- http://www.i18nWithVB.com/ Quote: > There should have been a method that returns all the Time Zones that the > computer knows about. Just as it can return a list of Fonts or Printers. > -- > Jonathan Allen > > Unfortunately, Windows and .NET only have a concept > > of one single, current system-wide time-zone... > > (= .NET internal 'CurrentSystemTimeZone' class) > > For WIN32: > > even the function > > SystemTimeToTzSpecificLocalTime() > > is not on Win9x, only on NT, and reverse > > TzSpecificLocalTimeToSystemTime() > > was just introduced for Windows XP! > > You may have to workaround: > > - get zone information (TZI) from registry > > (MS KB Q115231) > > - manualy add offsets to UTC times... > > (e.g. MS KB Q128126) > > also read the 'ClockRack' article by Charles Petzold: > > http://www.pcmag.com/article/0,2997,s%253D1478%2526a%253D4914,00.asp > > and java has (as for the new J#.NET) > > SimpleTimeZone class derived from TimeZone > > NETMaster > > http://www.cetus-links.org/oo_csharp.html > > > I need to convert times between various timezones.... however it seems > like > > > all of the TimeZone functions only deal with the time zone of the PC. > > > Why is the TimeZone class abstract? Do i have to basically make my own > > > class and inherit from TimeZone to implement the functionality I need?
Tue, 30 Mar 2004 07:28:00 GMT

Jonathan Alle #8 / 9	Timezones - who can answer this Quote: > I would not ecxpect time zones to be a > terribly visible feature that would be expected to "jump the tracks" and get > done earlier? I think they would be very helpful when designing Internet applications. Unless everyone switches to GMT, time conversions are going to be very frequent. -- Jonathan Allen Quote: > That is an opinion. > But the priority of the first version was obviously to give the > functionality of Win32 to the managed world. Future versions will > undoubtably expand on it.... but I would not ecxpect time zones to be a > terribly visible feature that would be expected to "jump the tracks" and get > done earlier? > -- > MichKa > Michael Kaplan > (principal developer of the MSLU) > Trigeminal Software, Inc. -- http://www.trigeminal.com/ > the book -- http://www.i18nWithVB.com/ > > There should have been a method that returns all the Time Zones that the > > computer knows about. Just as it can return a list of Fonts or Printers. > > -- > > Jonathan Allen > > > Unfortunately, Windows and .NET only have a concept > > > of one single, current system-wide time-zone... > > > (= .NET internal 'CurrentSystemTimeZone' class) > > > For WIN32: > > > even the function > > > SystemTimeToTzSpecificLocalTime() > > > is not on Win9x, only on NT, and reverse > > > TzSpecificLocalTimeToSystemTime() > > > was just introduced for Windows XP! > > > You may have to workaround: > > > - get zone information (TZI) from registry > > > (MS KB Q115231) > > > - manualy add offsets to UTC times... > > > (e.g. MS KB Q128126) > > > also read the 'ClockRack' article by Charles Petzold: > > > http://www.pcmag.com/article/0,2997,s%253D1478%2526a%253D4914,00.asp > > > and java has (as for the new J#.NET) > > > SimpleTimeZone class derived from TimeZone > > > NETMaster > > > http://www.cetus-links.org/oo_csharp.html > > > > I need to convert times between various timezones.... however it seems > > like > > > > all of the TimeZone functions only deal with the time zone of the PC. > > > > Why is the TimeZone class abstract? Do i have to basically make my > own > > > > class and inherit from TimeZone to implement the functionality I need?
Wed, 31 Mar 2004 11:33:20 GMT

michk #9 / 9	Timezones - who can answer this Quote: > > I would not ecxpect time zones to be a terribly visible feature > > that would be expected to "jump the tracks" and get done > > earlier? > I think they would be very helpful when designing Internet applications. > Unless everyone switches to GMT, time conversions are going to be very > frequent. This assumes that most people who design web services now or will design them in the future keep international issues in mind? In my experience, most people do not REAL:IZE what the first to initials of WWW stand for. I am sure this is the sort of thing that will be looked at in 7.l or 7..x or 8.0 or whatever they call it, but in the meantime there are always third party solutions, and there is JScript.Net (not to mention there is the long standing solution used in e-mail that has the client convert to GMT). In other words, no shortage of solutions, today or tomorrow. :-) -- MichKa Michael Kaplan (principal developer of the MSLU) Trigeminal Software, Inc. -- http://www.trigeminal.com/ the book -- http://www.i18nWithVB.com/
Thu, 01 Apr 2004 03:02:34 GMT

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