[tz] Fwd: [IANA #636310] how to check a time

Paul_Koning at Dell.com Paul_Koning at Dell.com
Fri Nov 30 18:55:01 UTC 2012

All you need is an up to date Unix system, then type these two commands:

TZ="/Pacific/Auckland" date
date -u

The former will show the current date/time in Auckland, the latter will show the current date/time in UTC.  When I do that on my Linux box, I see a 13 hour offset, as expected.

Also, if you look in the tzdata files (specifically, file "australasia") you'll find the rule for Auckland, which indeed says the base offset is 12 hours but DST is now in effect.  It shows that the DST start date has changed a bit over the years, but the latest it has ever been is first sunday in November.

So if your calendar program is showing today's time as 12 hours from UTC, that would suggest it doesn't do DST at all...


On Nov 28, 2012, at 8:28 PM, Gemma Conn wrote:


Can you point me in the direction of where I can double check that IANA has the correct time for New Zealand? I am worried that IANA has the wrong time for New Zealand, as Google Calendar which claims to use IANA Time Zone Database, displays the incorrect time for New Zealand. It displays GMT + 12 Auckland but it should be GMT + 13 Auckland, as we are observing Daylight Savings time.

Sorry I could not find the right place to check this on your website - can you please check for me or tell me where I can check what time the IANA Time Zone Database has for New Zealand? I will let Google know if the mistake lies with them.


Begin forwarded message:

From: Paul Eggert <eggert at cs.ucla.edu<mailto:eggert at cs.ucla.edu>>
Date: 29 November 2012 2:17:18 PM NZDT
To: Gemma Conn <gemma at biozone.co.nz<mailto:gemma at biozone.co.nz>>
Subject: Re: Fwd: [IANA #636310] how to check a time

On 11/28/2012 12:49 PM, Gemma Conn wrote:
I couldn't find the place on the IANA website where I can check a time...

I'm afraid there isn't a simple way to do that automatically.
I suggest you ask by sending email to tz at iana.org<mailto:tz at iana.org>.  This
mailing list is discussed in <http://www.iana.org/time-zones>.

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