The 2026e release of the tz code and data is available. This release is
prompted by Manitoba’s decision to stay on permanent UTC-05, which has a
practical effect starting 2026-11-01 at 02:00. Like the similar changes for
Alberta, British Columbia, and the Northwest Territories in the previous three
tzdata releases, there will likely be problems downstream as CLDR’s latest
release cannot handle it as specified.
This release contains the following changes:
Briefly:
Manitoba moves to permanent -05 on 2026-10-31.
Changes to future timestamps
Manitoba’s 2026-03-08 spring forward was its last foreseeable clock
change, as it moved to permanent -05 thereafter. Model this with
its traditional abbreviation EST. Although the change to
permanent -05 legally takes place on 2026-10-31, temporarily model
the change to occur on 2026-11-01 at 02:00 for the same reason as
other recent temporary hacks. (Caution: see “NOTE FOR 2026b
TEMPORARY HACK FOR CLDR AND CANADA” below.)
As the change affects both America/Winnipeg and its backward
compatibility link, the obsolescent setting TZ="Canada/Central"
will now use the abbreviation EST for affected timestamps,
akin to TZ="Canada/Pacific" behavior introduced in 2026b.
Another TZDB release may be needed soon if any of the portions of
northwestern Ontario historically aligned with America/Winnipeg do
not follow. For now, given the short leadtime with Manitoba’s
announcement, assume that they will, to avoid creating new zones
that may not be needed if no divergence occurs.
NOTE FOR 2026b TEMPORARY HACK FOR CLDR AND CANADA:
This temporary hack works around a Canadian timekeeping bug in
Unicode CLDR 48 and earlier. Unfortunately it also causes zic
2023d through 2026a, in the default slim mode, to generate a
TZif file that does not conform to Internet RFC 9636 §3.3.
The buggy file in turn causes some TZif readers, including tzcode
itself, to ignore America/Vancouver’s 2026-11-01 02:00 transition
from PDT (tm_isdst=1) to MST (tm_isdst=0). Although the buggy
file does not cause any known TZif reader to mishandle UT offsets,
caution is advised when using zic 2023d through 2026a to compile
data from more-recent tz releases. To work around this problem
when using these older zic versions, use ‘zic -b fat’.
Changes to past timestamps
In 1925 Ireland fell back on 09-20 not 10-04 (thanks to Stan Ulbrych).
Changes to commentary
Discussion on timekeeping practices in northwestern Ontario has been
expanded in light of Manitoba’s recent announcement. It is not yet
known whether or to what extent these areas may adapt their own
timekeeping practices in response.
Here are links to the release files:
https://www.iana.org/time-zones/repository/releases/tzcode2026e.tar.gz
https://www.iana.org/time-zones/repository/releases/tzdata2026e.tar.gz
https://www.iana.org/time-zones/repository/releases/tzdb-2026e.tar.lz
The following convenience links are also available, although they may point to
the previous release until the relevant caches are refreshed:
https://www.iana.org/time-zones/repository/tzcode-latest.tar.gz
https://www.iana.org/time-zones/repository/tzdata-latest.tar.gz
https://www.iana.org/time-zones/repository/tzdb-latest.tar.lz
Links are also available via plain HTTP, and via FTP from
ftp://ftp.iana.org/tz/releases with the same basenames as above.
Each release file has a GPG signature, which can be retrieved by appending
".asc" to the above URLs. Copies of these signatures are appended to this
message.
This release corresponds to commit 039ef27cc5f062a2055cb67435d6d71adbefd27d dated
2026-09-29 17:14:38 -0700 and tagged '2026e' in the development GitHub repository at
<https://github.com/eggert/tz>.
Here are the SHA-512 checksums for the release files:
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tzcode2026e.tar.gz
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tzdata2026e.tar.gz
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tzdb-2026e.tar.lz
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