[tz] Regarding timezone upgrade from 2017c to 2018c

[Debananda Pal]

Thank you very much Paul.
Please let me know any command to verify the timezone version and getting
output like 2017c, 2018c.

Regards,
D Pal

On Fri, Mar 2, 2018 at 11:16 PM, Paul Eggert <eggert at cs.ucla.edu> wrote:

> On 03/02/2018 05:16 AM, Debananda Pal wrote:
>
>> While upgrading to 2018c timezone, I found below changes :
>>
>> ./etc/localtime  ./etc/localtime    ==> Newly added
>> ./etc/zoneinfo/localtime -> GMT ==> This entry is removed
>>
>> ./etc/zoneinfo/GMT  ./etc/zoneinfo/GMT  ==> Changed to ==>
>> ./etc/zoneinfo/GMT link ./etc/localtime
>>
>
> Most likely you're observing effects of the change that was proposed here:
>
> https://mm.icann.org/pipermail/tz/2017-December/025783.html
>
> If by "." you mean the root of the destination directory, then yes, the
> link that used to be in ./etc/zoneinfo/localtime is now in ./etc/localtime
> by default. This is a link to the GMT file (a file that used to be in
> ./etc/zoneinfo/GMT and is now in ./usr/share/zoneinfo/GMT). You can restore
> the old behavior by setting the appropriate Makefile macro.
>
> ./etc/zoneinfo/US/Pacific-New -> ../America/Los_Angeles ==>  This entry is
>> removed
>>
>
> Yes, that's a consequence of the change proposed here:
>
> https://mm.icann.org/pipermail/tz/2017-November/025476.html
>
>
> ./etc/zoneinfo/Africa/Sao_Tome -> ../Atlantic/St_Helena  ==> Changed to
>>   ==>  ./etc/zoneinfo/Africa/Sao_Tome ./etc/zoneinfo/Africa/Sao_Tome
>>
>
> Yes, São Tomé and Príncipe got its own Zone, due to the change proposed
> here:
>
> https://mm.icann.org/pipermail/tz/2018-January/025802.html
>
> In general, if you are curious about changes like this, it's a good idea
> to clone the git repository here:
>
> https://github.com/eggert/tz
>
> You can then use commands like "git blame" to find out when things changed
> and why. For example, if you're curious about Africa/Sao_Tome, the command
> "git blame africa" outputs the the following lines, which identify the IDs
> and dates of the most-recent revisions affecting lines in Africa/Sao_Tome
> (there have been three so far this year, as it happens):
>
> 2951fa3b (Paul Eggert        2018-01-08 09:03:13 -0800 1068) Zone
> Africa/Sao_Tome     0:26:56 -    LMT    1884
> fff7816c (Paul Eggert        2018-02-16 16:11:42 -0800 1069)     -0:36:45
> -    LMT    1912 Jan  1 00:00u # Lisbon MT
> a4272fbf (Paul Eggert        2018-01-08 16:12:21 -0800 1070)      0:00
> -    GMT    2018 Jan  1 01:00
> 2951fa3b (Paul Eggert        2018-01-08 09:03:13 -0800 1071)      1:00
> -    WAT
>
> You can then issue commands like "git log 2951fa3b^!" and "git log
> 2951fa3b^!" to find more details about each of the three changes.
>
> Come to think of it, something like the above should be in the file
> CONTRIBUTING. Proposed patch attached.
>
>
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