[TZInfo-users] Canberra- EDT vs EST

Philip Ross phil.ross at gmail.com
Tue Nov 27 14:12:01 UTC 2012

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,


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