From: Axel Etzold <AEtzold@...>
Date: 2008-08-23T18:30:00+09:00
Subject: Re: DateTime in UTC


-------- Original-Nachricht --------
> Datum: Sat, 23 Aug 2008 07:56:11 +0900
> Von: "bcparanj@gmail.com" <bcparanj@gmail.com>
> An: ruby-talk@ruby-lang.org
> Betreff: Re: DateTime in UTC

> On Aug 22, 3:04�pm, Rick DeNatale <rick.denat...@gmail.com> wrote:
> > [Note: �parts of this message were removed to make it a legal post.]
> >
> >
> >
> > On Fri, Aug 22, 2008 at 2:52 PM, Axel Etzold <AEtz...@gmx.de> wrote:
> >
> > > -------- Original-Nachricht --------
> > > > Datum: Sat, 23 Aug 2008 03:31:10 +0900
> > > > Von: "bcpar...@gmail.com" <bcpar...@gmail.com>
> > > > An: ruby-t...@ruby-lang.org
> > > > Betreff: Re: DateTime in UTC
> >
> > > > > I created the following list of the expected behavior
> > > > fromhttp://www.google.com/googlecalendar/event_publisher_guide.html
> >
> > > > > Hour : Value in UTC
> > > > > 1 �: 0900
> > > > > 2 �: 1000
> > > > > 3 �: 1100
> > > > > 4 �: 1200
> > > > > 5 �: 1300
> > > > > 6 �: 1400
> > > > > 7 �: 1500
> > > > > 8 �: 1600
> > > > > 9 �: 1700
> > > > > 10 : 1800
> > > > > 11 : 1900
> > > > > 12 : 2000
> > > > > 13 : 2100
> > > > > 14 : 2200
> > > > > 15 : 2300
> > > > > 16 : 0000
> > > > > 17 : 0100
> > > > > 18 : 0200
> > > > > 19 : 0300
> > > > > 20 : 0400
> > > > > 21 : 0500
> > > > > 22 : 0600
> > > > > 23 : 0700
> > > > > 00 : 0800
> >
> > > > > Hour:Mins - UTC value
> > > > > 00:00 - 0800
> > > > > 00:15 - 0815
> > > > > 00:30 - 0830
> > > > > 00:45 - 0845
> >
> > > > > It seems to be using some offset to convert the given date to UTC
> > > > > values. I don't know how to convert a given hour to its UTC value.
> >
> > > > Sorry, I meant converting from Date or DateTime object to UTC values
> > > > similar to above sample data for hours and mins. Thanks.
> >
> > > One of the two times is your local time zone (if it's +08:00, you'll
> most
> > > probably be in China, Malaysia, Singapore,
> > > the Philippines, somepart of central Indonesia �or in Western
> Australia.)
> > > There is a database collecting time zone details, including daylight
> > > savings time, by Mr. Olson,
> > > and there's a Ruby library to convert from and into UTC ,which is
> basically
> > > the time zone of
> > > England, disregarding daylight savings time there.
> >
> > > Look here :
> >
> > >http://tzinfo.rubyforge.org/
> > >http://www.worldtimezone.com/index24.html�(the map has nice zoom-in
> > > properties)
> >
> > > Best regards,
> >
> > And for most timezones, the utc offset depends also on the full time,
> since
> > it is different during the period, if any, for which daylight saving
> time is
> > observed for the particular timezone.
> >
> > The TZinfo gem can be used to handle this, once you dig in and
> understand
> > it.
> >
> > --
> > Rick DeNatale
> >
> > My blog on Rubyhttp://talklikeaduck.denhaven2.com/
> 
> Actually, this is for a Rails project. Will the Rails 2.1 help in this
> case?

You'll have to ask that on the Rails mailing list or test it out yourself.

Best regards,

Axel 
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