= Proposed System Wide Change: The tzdata transition to 'vanguard' format =
https://fedoraproject.org/wiki/Changes/TZDATA-VANGUARD


Owner(s):
  * Patsy Franklin <pfrankli at redhat dot com>


As of tzdata-2018e, the upstream will now default to using the
'vanguard' data format including negative DST offsets.  As a
fall-back, the 'rearguard' data format is still available on F28, F27
and F26.



== Detailed description ==
tzdata-2018e defaults to the 'vanguard' data format.  This format
includes the POSIX compliant implementations of negative DST offsets
which have been an issue for both Java and ICU parsers. We plan to
transition to this default format in F29.


== Scope ==
* Proposal owners:
Implement the proposal.

* Other developers:
Developers need to ensure that their packages are able to correctly
parse and/or build with the new tzdata 'vanguard' format.

* Release engineering:
The tzdata maintainer will ensure that the package builds and passes
all tests on F29.
RelEng ticket: https://pagure.io/releng/issue/7510 #7510

* Policies and guidelines:
The policies and guidelines do not need to be updated.

* Trademark approval:
Not needed for this change
-- 
Jan Kuřík
JBoss EAP Program Manager
Red Hat Czech s.r.o., Purkynova 99/71, 612 45 Brno, Czech Republic
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