Which places have stopped changing their clocks
144 of the 312 zones in the tz database moved their clocks for summer at some point between 1970 and 2026 and no longer do under the rules in release 2026f. 101 zones still change their clocks, and 67 have not had a seasonal change at all since 1970.
The peak came in 1988
Seasonal clock changes were far from universal in 1970: 53 zones had a period of summer time that year. The number climbed through the 1970s and early 1980s, with the largest one-year jump in 1981, when 26 of Russia’s zones began seasonal changes, and reached 188 zones in 1988. It has drifted down ever since. In 2026 it was 107, and the rules in force for 2027 leave 101.
Zones with seasonal clock changes, each year from 1970 to 2026
Number of zones (out of 312) with at least some days of summer time in the year. 1988 is highlighted.
The fall is not a slow fade. It happened in a handful of years when whole countries stopped at once, and most of those decisions are visible as sharp steps in the chart.
The years of the big exits
The largest single step came in 2010, the last year with seasonal changes for 28 zones: 26 in Russia, plus Belarus and Falkland Islands. In Russia the clocks fell back in October 2010, moved forward in March 2011 to a new standard time, and in October 2014 moved back by an hour in 22 of its 26 zones, so those records show several steps rather than one.
2022 was the next big year, with 9 zones: 6 in Mexico, along with Iran, Jordan and Syria. In 2026 the database recorded 6 more: Edmonton, Inuvik, Vancouver and Winnipeg in Canada, plus Western Sahara and Morocco. Earlier waves were smaller and more scattered: Argentina’s provinces stopped in 2008 and 2009, Kazakhstan in 2004, and several Brazilian states at different times between 1988 and 2019.
| Last year with summer time | Zones | Where |
|---|---|---|
| 2026 | 6 | Canada (4), Western Sahara and Morocco |
| 2022 | 9 | Mexico (6), Iran, Jordan and Syria |
| 2016 | 5 | Mongolia (2), Antarctica, Chile and Turkey |
| 2010 | 28 | Russia (26), Belarus and Falkland Islands |
| 2009 | 9 | Argentina (4), Australia (2), Bangladesh, Mauritius and Pakistan |
| 2008 | 9 | Argentina (8) and Tunisia |
| 2004 | 8 | Kazakhstan (7) and Georgia |
| 2002 | 4 | Brazil (4) |
| 1994 | 4 | Brazil (2), Australia and Peru |
| 1993 | 4 | Ecuador (2), Colombia and Vanuatu |
| 1991 | 6 | Uzbekistan (2), Cook Islands, China, Tajikistan and Turkmenistan |
| 1988 | 6 | Brazil (4), South Korea and El Salvador |
| 1980 | 4 | Barbados, Algeria, Martinique and Chad |
Two ways to stop
A zone can leave daylight saving time in two ways, and the record shows which one it chose. It can fall back for the last time and stay on its old standard time, or it can stop at the summer offset and declare that the new standard time. Of the 144 zones that stopped, 122 took the first route and 22 the second.
The second route is the one most often discussed in public debates about ending clock changes, and it is the one taken this year in Canada: in the Edmonton, Inuvik, Vancouver and Winnipeg zones, the summer offset became standard time and the clocks did not move in the autumn. Turkey did the same in 2016, Jordan and Syria in 2022, and five regions of Kazakhstan and two of Chile at different dates. Mexico in 2022 mostly went the other way: 5 of the 6 Mexican zones that stopped that year fell back for the last time and stayed on standard time.
The difference matters for anyone reading an old timestamp. A zone that kept its summer offset now has a different standard time from the one in its older records, which is why the standard time table on each zone page lists these moves as changes of standard time even when the clocks did not move.
Where clocks still change
Seasonal changes are now concentrated in two places. North and Central America has the largest number of zones that still change, mostly because the United States, Canada and parts of Mexico are split into many zones in the database. Europe follows, with almost every zone on the same last-Sunday-of-March and last-Sunday-of-October pattern. Elsewhere the practice is rare: a few zones in Oceania change, while most of Asia, Africa and South America does not.
| Region | Zones | Still changing clocks |
|---|---|---|
| North America | 80 | 48 |
| Europe | 38 | 27 |
| Oceania | 42 | 11 |
| Asia | 74 | 6 |
| Atlantic | 8 | 5 |
| Africa | 19 | 2 |
| Antarctica | 7 | 1 |
| South America | 41 | 1 |
| Indian Ocean | 3 | 0 |
These counts are of zones, not of people or countries. A large country split into many zones weighs more here than a small one with a single zone, and a zone used by several countries counts once. The full list of zones that dropped daylight saving time gives the last year for each, and the clock change dates for 2026 to 2028 list every zone that still changes.
What “no longer” means
Every statement here is about the rules in the tz database as of release 2026f. Governments have restarted clock changes before: the database shows several zones with summer time in the 1970s or 1980s, a gap of many years, and a return later. Egypt is a recent example: its record has no summer time between 2014 and 2023, when the clocks started changing again. A zone listed as having stopped is one whose current rules contain no seasonal change, not a promise that none will come back.
Source: IANA Time Zone Database, release 2026f (public domain), computed by this site; see about the data for definitions. Look up any zone in the converter.