From stephane at coupa.com  Thu Nov  1 22:56:52 2012
From: stephane at coupa.com (Stephane Pelchat)
Date: Thu, 1 Nov 2012 15:56:52 -0700
Subject: [TZInfo-users] Solomon Island & daylight savings time
Message-ID: <CAJxbR6CtaSeqzjsLMcezY2DWvjjAk84BgkkYjvz6pp9BXxngMg@mail.gmail.com>

Hi,


We have received a report that the Solomon Island timezone is being
calculated as if daylight savings was observed there, but it is in fact not
the case.

- Using tzinfo (0.3.31)
- "Pacific - Guadalcanal"
- ActiveSupport::TimeZone.all returns: "(GMT+12:00) Solomon Is."

But Solomon Island should be GMT+11 (
http://www.timeanddate.com/library/abbreviations/timezones/pacific/sbt.html)


Any help or information on this matter would be appreciated, thanks

-St?phane
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From phil.ross at gmail.com  Thu Nov  1 23:56:35 2012
From: phil.ross at gmail.com (Philip Ross)
Date: Thu, 1 Nov 2012 23:56:35 +0000
Subject: [TZInfo-users] Solomon Island & daylight savings time
In-Reply-To: <CAJxbR6CtaSeqzjsLMcezY2DWvjjAk84BgkkYjvz6pp9BXxngMg@mail.gmail.com>
References: <CAJxbR6CtaSeqzjsLMcezY2DWvjjAk84BgkkYjvz6pp9BXxngMg@mail.gmail.com>
Message-ID: <CAMhnMW0fgZ6D9D4cJ1_RGgawGt2r_yqEna7pKUsFv3aWhao9uQ@mail.gmail.com>

Hi Stephane,

On 1 November 2012 22:56, Stephane Pelchat <stephane at coupa.com> wrote:
> We have received a report that the Solomon Island timezone is being
> calculated as if daylight savings was observed there, but it is in fact not
> the case.
>
> - Using tzinfo (0.3.31)
> - "Pacific - Guadalcanal"
> - ActiveSupport::TimeZone.all returns: "(GMT+12:00) Solomon Is."
>
> But Solomon Island should be GMT+11
> (http://www.timeanddate.com/library/abbreviations/timezones/pacific/sbt.html)

TZInfo does return an offset of GMT+11 for the Solomon Islands
(Pacific/Guadalcanal) and indicates that daylight savings is not
observed:

> zone = TZInfo::Timezone.get('Pacific/Guadalcanal')
> period = zone.period_for_utc(Time.utc(2013, 1, 1))
> period.utc_total_offset / 3600.0
=> 11.0
> period.dst?
=> false

ActiveSupport::TimeZone maps "Solomon Is." to the Asia/Magadan
timezone (in the MAPPING Hash in
lib/active_support/values/time_zone.rb). Since Magadan is a town in
Russia that observes a timezone of GMT+12, the ActiveSupport mapping
would appear to be incorrect.

Kind regards,

Phil

From stephane at coupa.com  Fri Nov  2 00:33:26 2012
From: stephane at coupa.com (Stephane Pelchat)
Date: Thu, 1 Nov 2012 17:33:26 -0700
Subject: [TZInfo-users] Solomon Island & daylight savings time
In-Reply-To: <CAMhnMW0fgZ6D9D4cJ1_RGgawGt2r_yqEna7pKUsFv3aWhao9uQ@mail.gmail.com>
References: <CAJxbR6CtaSeqzjsLMcezY2DWvjjAk84BgkkYjvz6pp9BXxngMg@mail.gmail.com>
	<CAMhnMW0fgZ6D9D4cJ1_RGgawGt2r_yqEna7pKUsFv3aWhao9uQ@mail.gmail.com>
Message-ID: <CAJxbR6CCpBGm=4HbnkP-a5tn9Ky-W2__LYoQCbUsNam_WoL9Lg@mail.gmail.com>

Thanks for the investigation Phil!

I'll follow up with the ActiveSupport team,

-S

On Thu, Nov 1, 2012 at 4:56 PM, Philip Ross <phil.ross at gmail.com> wrote:

> Hi Stephane,
>
> On 1 November 2012 22:56, Stephane Pelchat <stephane at coupa.com> wrote:
> > We have received a report that the Solomon Island timezone is being
> > calculated as if daylight savings was observed there, but it is in fact
> not
> > the case.
> >
> > - Using tzinfo (0.3.31)
> > - "Pacific - Guadalcanal"
> > - ActiveSupport::TimeZone.all returns: "(GMT+12:00) Solomon Is."
> >
> > But Solomon Island should be GMT+11
> > (
> http://www.timeanddate.com/library/abbreviations/timezones/pacific/sbt.html
> )
>
> TZInfo does return an offset of GMT+11 for the Solomon Islands
> (Pacific/Guadalcanal) and indicates that daylight savings is not
> observed:
>
> > zone = TZInfo::Timezone.get('Pacific/Guadalcanal')
> > period = zone.period_for_utc(Time.utc(2013, 1, 1))
> > period.utc_total_offset / 3600.0
> => 11.0
> > period.dst?
> => false
>
> ActiveSupport::TimeZone maps "Solomon Is." to the Asia/Magadan
> timezone (in the MAPPING Hash in
> lib/active_support/values/time_zone.rb). Since Magadan is a town in
> Russia that observes a timezone of GMT+12, the ActiveSupport mapping
> would appear to be incorrect.
>
> Kind regards,
>
> Phil
> _______________________________________________
> TZInfo-users mailing list
> TZInfo-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/tzinfo-users
>



-- 
St?phane Pelchat
Development Director

Coupa Software | www.coupa.com
stephane at coupa.com
925.528.9848

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From tom at moulton.us  Fri Nov 16 03:12:26 2012
From: tom at moulton.us (Thomas A. Moulton)
Date: Thu, 15 Nov 2012 22:12:26 -0500
Subject: [TZInfo-users] strftime %Z
Message-ID: <50A5AF1A.4090604@moulton.us>

How can I use strftime to display a time in the format "20:45 EDT"

I looked at 
http://tzinfo.rubyforge.org/doc/classes/TZInfo/Timezone.html#M000060
and think that "%H:%M %Z" would do it, but no joy.

         now = DateTime.now.new_offset(0)
         ltime = tz.utc_to_local(now)
         otime = ltime.strftime("%H:%M %Z")

returns "14:07 +00:00"

Can anyone provide an example for me?

Tom

From tom at moulton.us  Sat Nov 17 01:31:17 2012
From: tom at moulton.us (Thomas A. Moulton)
Date: Fri, 16 Nov 2012 20:31:17 -0500
Subject: [TZInfo-users] strftime %Z
In-Reply-To: <50A5AF1A.4090604@moulton.us>
References: <50A5AF1A.4090604@moulton.us>
Message-ID: <50A6E8E5.3070103@moulton.us>

Ok I figured it out... helps to RTFM but I have to say examples help 
dummies in a rush (me!)

otime = tz.strftime("%H:%M %Z", next_time)

tom

On 11/15/2012 10:12 PM, Thomas A. Moulton wrote:
> How can I use strftime to display a time in the format "20:45 EDT"
>
> I looked at 
> http://tzinfo.rubyforge.org/doc/classes/TZInfo/Timezone.html#M000060
> and think that "%H:%M %Z" would do it, but no joy.
>
>         now = DateTime.now.new_offset(0)
>         ltime = tz.utc_to_local(now)
>         otime = ltime.strftime("%H:%M %Z")
>
> returns "14:07 +00:00"
>
> Can anyone provide an example for me?
>
> Tom
> _______________________________________________
> TZInfo-users mailing list
> TZInfo-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/tzinfo-users
>

From gsmedley at eastlink.ca  Tue Nov 27 12:08:07 2012
From: gsmedley at eastlink.ca (Garth Home)
Date: Tue, 27 Nov 2012 08:08:07 -0400
Subject: [TZInfo-users] Canberra-  EDT vs EST
Message-ID: <50B4AD27.8030608@eastlink.ca>

Hi,

Using tzinfo 0.3.35. With the timezone "Australia/Canberra" the time shows +11, which is right (+10
and +1 for DST), but I get EST for the zone abbreviation. Shouldn't that be EDT?

Garth Smedley


From tom at moulton.us  Tue Nov 27 13:14:35 2012
From: tom at moulton.us (Thomas A. Moulton)
Date: Tue, 27 Nov 2012 08:14:35 -0500
Subject: [TZInfo-users] Canberra-  EDT vs EST
In-Reply-To: <50B4AD27.8030608@eastlink.ca>
References: <50B4AD27.8030608@eastlink.ca>
Message-ID: <50B4BCBB.6010802@moulton.us>

Can you show a snippet of code to demonstrate this?

I ask because I was working with this kind of thing and found a lot of 
ways to do
things that did not generate an error and did not return anything useful.

I think if you run the same demo code on a time 6 months from now it will
also show EST.

I ended up using dst? (or is it is_dst?) as part of time_period to 
figure out what to display
and then using my own function to generate that string

tom


On 11/27/2012 07:08 AM, Garth Home wrote:
> Hi,
>
> Using tzinfo 0.3.35. With the timezone "Australia/Canberra" the time shows +11, which is right (+10
> and +1 for DST), but I get EST for the zone abbreviation. Shouldn't that be EDT?
>
> Garth Smedley
>
> _______________________________________________
> TZInfo-users mailing list
> TZInfo-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/tzinfo-users
>
>    

From gsmedley at eastlink.ca  Tue Nov 27 13:35:56 2012
From: gsmedley at eastlink.ca (Garth Home)
Date: Tue, 27 Nov 2012 09:35:56 -0400
Subject: [TZInfo-users] Canberra-  EDT vs EST
In-Reply-To: <50B4BCBB.6010802@moulton.us>
References: <50B4AD27.8030608@eastlink.ca> <50B4BCBB.6010802@moulton.us>
Message-ID: <50B4C1BC.3070707@eastlink.ca>


At the moment Canberra is on DST, so I would expect the abbreviation to be EDT rather than EST, but
when I run from the rails console:

Time.zone = "Australia/Canberra"
=> "Australia/Canberra"
Time.zone.now
=> Tue, 27 Nov 2012 22:46:23 EST +11:00

Other time zones do have different abbreviations for DST & non-DST times, "US/Eastern", for example,
has EDT/EST.

I can see that in the tzinfo Sydney.rb file, which Canberra is linked to, the entry for DST has
"EST" as the abbreviation. This looks like a bug to me, but I'm new to tzinfo, so maybe I'm missing
something.

-- Garth Smedley



On 27/11/2012 9:14 AM, Thomas A. Moulton wrote:
> Can you show a snippet of code to demonstrate this?
>
> I ask because I was working with this kind of thing and found a lot of ways to do
> things that did not generate an error and did not return anything useful.
>
> I think if you run the same demo code on a time 6 months from now it will
> also show EST.
>
> I ended up using dst? (or is it is_dst?) as part of time_period to figure out what to display
> and then using my own function to generate that string
>
> tom
>
>
> On 11/27/2012 07:08 AM, Garth Home wrote:
>> Hi,
>>
>> Using tzinfo 0.3.35. With the timezone "Australia/Canberra" the time shows +11, which is right (+10
>> and +1 for DST), but I get EST for the zone abbreviation. Shouldn't that be EDT?
>>
>> Garth Smedley
>>
>> _______________________________________________
>> TZInfo-users mailing list
>> TZInfo-users at rubyforge.org
>> http://rubyforge.org/mailman/listinfo/tzinfo-users
>>
>>    
> _______________________________________________
> TZInfo-users mailing list
> TZInfo-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/tzinfo-users
>


From phil.ross at gmail.com  Tue Nov 27 14:12:01 2012
From: phil.ross at gmail.com (Philip Ross)
Date: Tue, 27 Nov 2012 14:12:01 +0000
Subject: [TZInfo-users] Canberra- EDT vs EST
In-Reply-To: <50B4C1BC.3070707@eastlink.ca>
References: <50B4AD27.8030608@eastlink.ca> <50B4BCBB.6010802@moulton.us>
	<50B4C1BC.3070707@eastlink.ca>
Message-ID: <CAMhnMW0-Z_THhSqqrMg2ikeJPJN-Ja68QF8g6qUp4-PehcSY=w@mail.gmail.com>

Hi Garth,

On 27 November 2012 13:35, Garth Home <gsmedley at eastlink.ca> wrote:
> I can see that in the tzinfo Sydney.rb file, which Canberra is linked to, the entry for DST has
> "EST" as the abbreviation. This looks like a bug to me, but I'm new to tzinfo, so maybe I'm missing
> something.

The data included in TZInfo comes from the public domain Time Zone
Database (http://www.iana.org/time-zones). The Time Zone Database
defines the Australia/Sydney zone with the EST abbreviation for both
standard and daylight saving time, where EST stands for both Eastern
Standard Time and Eastern Summer Time:

$ zdump -v Australia/Sydney | grep 2012
Australia/Sydney  Sat Mar 31 15:59:59 2012 UTC = Sun Apr  1 02:59:59
2012 EST isdst=1 gmtoff=39600
Australia/Sydney  Sat Mar 31 16:00:00 2012 UTC = Sun Apr  1 02:00:00
2012 EST isdst=0 gmtoff=36000
Australia/Sydney  Sat Oct  6 15:59:59 2012 UTC = Sun Oct  7 01:59:59
2012 EST isdst=0 gmtoff=36000
Australia/Sydney  Sat Oct  6 16:00:00 2012 UTC = Sun Oct  7 03:00:00
2012 EST isdst=1 gmtoff=39600

There has been some debate on the Time Zone Database mailing list
about whether the abbreviations should be changed (most recently in
this thread: http://mm.icann.org/pipermail/tz/2012-October/018287.html).

Kind regards,

Phil

From gsmedley at eastlink.ca  Tue Nov 27 14:48:21 2012
From: gsmedley at eastlink.ca (Garth Home)
Date: Tue, 27 Nov 2012 10:48:21 -0400
Subject: [TZInfo-users] Canberra- EDT vs EST
In-Reply-To: <CAMhnMW0-Z_THhSqqrMg2ikeJPJN-Ja68QF8g6qUp4-PehcSY=w@mail.gmail.com>
References: <50B4AD27.8030608@eastlink.ca> <50B4BCBB.6010802@moulton.us>
	<50B4C1BC.3070707@eastlink.ca>
	<CAMhnMW0-Z_THhSqqrMg2ikeJPJN-Ja68QF8g6qUp4-PehcSY=w@mail.gmail.com>
Message-ID: <50B4D2B5.3070900@eastlink.ca>

Hi Phil,

On 27/11/2012 10:12 AM, Philip Ross wrote:
> There has been some debate on the Time Zone Database mailing list

Thanks for the reply and the link, wow, what a can of worms.

-- Garth Smedley