Daylight Saving Time

UCS - Univention Corporate Server
1

Hi,
This year there was a change to the beginning of daylight saving time in Brazil. How do I correct this change and prevent DST from starting on the wrong date?

Best regards,
Michael Voigt

2

Hey,

you keep your systems up to date, especially the package tzdata which contains the time zone data files. It is updated more or less regularly. Its /usr/share/doc/tzdata/changelog.gz says, for example:

Release 2018a - 2018-01-12 22:29:21 -0800

  Briefly:
  São Tomé and Príncipe switched from +00 to +01.
  Brazil's DST will now start on November's first Sunday.
  Ireland's standard time is now in the summer, not the winter.
  Use Debian-style installation locations, instead of 4.3BSD-style.
  New zic option -t.

  Changes to past and future time stamps

    São Tomé and Príncipe switched from +00 to +01 on 2018-01-01 at
    01:00.  (Thanks to Steffen Thorsen and Michael Deckers.)

  Changes to future time stamps

    Starting in 2018 southern Brazil will begin DST on November's
    first Sunday instead of October's third Sunday.  (Thanks to
    Steffen Thorsen.)

m.

3

Hi
Moritz, in UCS I can only update the tzdata package? What would be the command for this?

Best Regards,
Michael Voigt

4

You can run apt-get update followed by apt-get install tzdata. However, that won’t cross release boundaries and you’ll likely end up missing updates. For example, if you’re currently running 4.2-2, new packages for 4.2-x might only be available for 4.2-4 or 4.2-5.

Don’t rely on this!

5

We ship tzdata updates as part of our regular Errata updates. If you are at least on UCS 4.2-4 errata 484 or UCS 4.3-0 errata 83 or higher, the correct tzdata package is installed.

1 Like
6

I think it is wrong because the change from start date to daylight saving time has been changed by the Brazilian government a few days, so I think it is wrong.

7

The start of daylight savings time would be on 11/04/2018 here in Brazil, but was postponed to 11/18/2018…

8

need to do a new tzdata update … see the reason below

The Brazilian president just announced a new change on this year DST.
It was scheduled to start on November 4th and it was changed to November 18th.
From Paul Eggert (2018-10-04):
This attempts to avoid confusion during the November 4 and 11 national high
school exams, which were mis-scheduled. Guess that’s just this year.

9

Thanks for the information. We have to wait for an update to the upstream tzdata package. There already is a debian bug report for this.

10

Hi,
I will be aware of this change and as soon as the fix is available notice you.

Thank you,

Michael Voigt

11

Hi,
Brazil’s daylight saving time will not be modified again, however a new release of tzdata has been released that solves other problems.

https://mm.icann.org/pipermail/tz-announce/2018-October/000051.html

Best regards,
Michael Voigt