The metadata compiled herewithin is secondary to the tz repository and is derived from the archives of the tz discussion list as well as commits to the tz development repository. Metadata is limited to changes affecting UTC offsets for current and/or future timestamps at the time that notice is sent. Pull requests will NOT be accepted for a given timezone change until it has been proposed to the tz mailing list at, discussed as necessary, been committed to the tz development repository, and (in general) released.

Changes with notice first sent in 2017

Country Affected Zones Description Earliest effective date for UTC offset changes Initial notice sent to tz discussion list Commits to development repository tz release Notes
BR πŸ‡§πŸ‡· Brazil America/Sao_Paulo, America/Campo_Grande, America/Cuiaba Brazil delays DST start by two weeks or so, to 2018-11-04 at 00:00. 2018-10-21T03:00:00Z 2017-12-18T10:22:58Z
Leadtime: 306d, 16.6h

Leadtime: 305d, 7.1h
Leadtime: 270d, 5.2h
This change was tagged earlier in 2018a and 2018b, which were never officially released.
TO πŸ‡ΉπŸ‡΄ Tonga Pacific/Tongatapu Tonga likely switches from +13/+14 to +13 by not adjusting its clocks on 2017-11-05 at 02:00. 2017-11-04T13:00:00Z 2017-10-18T09:36:46Z
Leadtime: 17d, 3.4h

Leadtime: 16d, 18.7h
Leadtime: 11d, 21.0h
It was not known at the time whether Tonga would observe DST.
CY πŸ‡¨πŸ‡Ύ Cyprus Asia/Famagusta Northern Cyprus switches from +03 to +02/+03 on 2017-10-29 at 04:00. 2017-10-29T01:00:00Z 2017-10-18T08:48:35Z
Leadtime: 10d, 16.2h

Leadtime: 10d, 16.2h
Leadtime: 5d, 9.0h
SD πŸ‡ΈπŸ‡© Sudan Africa/Khartoum Sudan switches from +03 to +02 on 2017-11-01. 2017-10-31T21:00:00Z 2017-10-17T00:34:32Z
Leadtime: 14d, 20.4h

Leadtime: 13d, 13.3h
Leadtime: 8d, 5.0h
FJ πŸ‡«πŸ‡― Fiji Pacific/Fiji Fiji ends DST on 2018-01-14 at 03:00, not 2018-01-21. 2018-01-13T14:00:00Z 2017-08-20T23:27:24Z
Leadtime: 145d, 14.5h

Leadtime: 145d, 4.7h
Leadtime: 81d, 22.0h
NA πŸ‡³πŸ‡¦ Namibia Africa/Windhoek Namibia switches from +01/+02 to +02 on 2017-09-03 at 02:00, affecting UT offsets from 2018-04-01 at 02:00. 2018-04-01T00:00:00Z 2017-08-09T12:47:38Z
Leadtime: 234d, 11.2h

Leadtime: 233d, 23.8h
Leadtime: 159d, 8.0h
TC πŸ‡ΉπŸ‡¨ Turks and Caicos Islands America/Grand_Turk Turks & Caicos switches from -04 to -05/-04 on 2018-03-11 at 03:00, affecting UT offsets from 2018-11-04 at 02:00. 2018-11-04T06:00:00Z 2017-07-23T01:14:59Z
Leadtime: 469d, 4.8h

Leadtime: 434d, 22.1h
Leadtime: 376d, 14.0h
HT πŸ‡­πŸ‡Ή Haiti America/Port-au-Prince Haiti resumed observance of DST on 2017-03-12 at 02:00. 2017-03-12T07:00:00Z 2017-03-12T14:51:05Z
Leadtime: −0d, 7.9h

Leadtime: −0d, 12.2h
Leadtime: −11d, 0.2h
MN πŸ‡²πŸ‡³ Mongolia Asia/Hovd, Asia/Ulaanbaatar, Asia/Choibalsan Mongolia no longer observes DST, affecting UT offsets from 2017-03-25 at 02:00. 2017-03-24T18:00:00Z 2017-02-08T17:42:23Z
Leadtime: 44d, 0.3h

Leadtime: 44d, 0.3h
Leadtime: 23d, 19.0h

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