Thx for the answer. I opened upstream ticket to doublecheck this:

https://github.com/tzinfo/tzinfo/issues/88


V.


Dne 24.5.2018 v 19:32 Patsy Franklin napsal(a):
> Hi,
>
> Thank you for your input on this!
>
> The concern is that, in some cases, applications that parse the tzdata
> files were not expecting to find negative DST offsets (negative SAVE
> values in the data files) despite the fact that POSIX appears to
> support this. 
>
> As this is now the default format for tzdata,  these applications
> should be fixed to recognize the negative DST offsets.
>
> (NOTE: For f26, f27 and f28, we have provided the rearguard format to
> continue to support existing applications.  This proposal announces
> the transition to vanguard format, allowing time to update
> applications in f29.)
>
> On Wed, May 23, 2018 at 4:51 AM, Vít Ondruch <vondr...@redhat.com
> <mailto:vondr...@redhat.com>> wrote:
>
>     Is this going to be backward compatible or not? rubygem-tzinfo is
>     using
>     tzdata as data source, so I wonder if any action is required.
>
>
> Yes, it's backward compatible if your application recognizes that
> tzdata SAVE values/DST's can be negative. 
>  
> Thanks,
> Patsy
>
>
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