[tz] Indian Continent

Jonathan Leffler jonathan.leffler at gmail.com
Mon Oct 12 20:15:45 UTC 2020

Thank you for your response. I note that your message didn't go to the
tz at iana.org mailing list.  I've copied the list again with this message.  I
have no official status on the team that maintains TZDB; I'm merely an
interested observer.  Therefore, anything I say can be overridden by that
team.  But I believe I'm following the "party line" on the topic.

I'm not clear what your response is claiming.  Are there 50 different sets
of rules for different cities in India for changes in time zone since
1970?  Unless there are different time zone rules for different areas of
India, one entry does for all of India.

Whether I like it or not (and I don't), America/Los_Angeles is the official
name for the time zone in all of California, even the bits that would
rather Los Angeles didn't exist.  To have the remotest chance of success,
you will need to persuade those who maintain the TZDB that there are
different time rules for different parts of India since 1970-01-01.  You
can look through the mailing list archives to see other people's request
for similar changes that have been denied for similar reasons.  Occam's
Razor (https://en.wikipedia.org/wiki/Occam%27s_razor) comes into effect:
Entia Non Sunt Multiplicanda Praeter Necessitatum (Do not multiply entities
unless necessary).  Adding more city names would be multiplying entities
without good reason.

If you wish to create historical information for different time zones in
India before 1970-01-01, then you may have some luck, but you'd need to
provide the data, with references to official or authoritative sources of
information about the different time zones.  But that becomes more
specialized — it might not make it into the main TZDB distribution because
the time zones within India have not diverged by location for the last 50
years or more.

On Mon, Oct 12, 2020 at 12:16 PM Bharat Adur <bharatadur at gmail.com> wrote:

> Dear Sir,
> We find for India there is certain bias taken by some individuals in a
> country which has such a large population and its Indian Standard Time (IST
> UT= 5hours 30 minutes), which is accepted by National Physical Laboratory
> (NPL),New Delhi  and Astronomical Society of India. our norm of 1970 cannot
> be acceptable to Modern India hence its our humble request you to consider
> IST  UT= 5hours 30 minutes. and if you desire we can send you at least 50
> cities. therein.
> With warm Regards
> Bharat Adur
> On Mon, Oct 12, 2020 at 10:44 PM Jonathan Leffler <
> jonathan.leffler at gmail.com> wrote:
>> The way the TZDB works is that if all areas of a country have used the
>> same time rules since 1st January 1970, there will be a single time zone
>> entry for that country.
>> Are there any parts of India that have not used the same time rules as
>> Asia/Calcutta (Asia/Kolkata?) since 1970-01-01?  If not, there is no reason
>> to introduce any new zones.  If you have an application that wishes to
>> provide alternative names, then you may.  It is not recommended that the
>> names in the database are shown to end users in any case.
>> This is discussed in the theory.html file distributed with the TZDB data.
>> On Mon, Oct 12, 2020 at 8:47 AM Bharat Adur <bharatadur at gmail.com> wrote:
>>> Dear Sir
>>> Indian is very large country with over 130 billion population with 28
>>> states and over fifty major cities including Mumbai.
>>> However in your catalog list for India in tz list , we have only as
>>> Asia/Calcutta.
>>> Can you kindly introduce in python in tz it should locate the place and
>>> th local time,
>>> with best regards
>>> Bharat Adur
>> --
>> Jonathan Leffler <jonathan.leffler at gmail.com>  #include <disclaimer.h>
>> Guardian of DBD::Informix - v2018.1031 - http://dbi.perl.org
>> "Blessed are we who can laugh at ourselves, for we shall never cease to
>> be amused."

Jonathan Leffler <jonathan.leffler at gmail.com>  #include <disclaimer.h>
Guardian of DBD::Informix - v2018.1031 - http://dbi.perl.org
"Blessed are we who can laugh at ourselves, for we shall never cease to be
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