Which major regions still observe daylight saving time?

Most of Europe, the United States (except Arizona and Hawaii), Canada, much of Australia and New Zealand, and parts of South America still observe DST. Many countries near the equator and a growing number of others, such as Russia, Turkey, and most of Asia and Africa, do not.

When do the EU and US switch their clocks?

The EU springs forward on the last Sunday of March and falls back on the last Sunday of October, changing at 01:00 UTC. The US springs forward on the second Sunday of March and falls back on the first Sunday of November, changing at 02:00 local time. The two-week offset means transatlantic time differences temporarily shift.

Why do southern-hemisphere countries switch in opposite months?

Daylight saving aims to shift an hour of daylight into the evening during the lighter half of the year. Because summer in the southern hemisphere falls around December to February, countries like Australia and Chile spring forward in spring (around September to October) and fall back around March to April, mirroring the north.

Has anywhere abolished DST recently?

Yes. Several countries have ended seasonal clock changes, including Russia, Turkey, and most recently regions reconsidering the practice. The EU has debated abolishing DST entirely, though no fixed date has been adopted. Always verify against the current IANA time zone database, which records each change.

How should software handle DST?

Software should never hardcode transition dates. Use the IANA time zone database via the platform's time library, store absolute instants in UTC, and convert to local time only for display. The IANA data is updated whenever a country changes its rules, so your conversions stay correct.

Daylight Saving Time by Country Reference

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Daylight saving time is far from universal, and the countries that use it switch on different dates and in opposite calendar months depending on hemisphere. This searchable reference summarises DST observance by country or region, with the typical transition rules and clock-change direction.

How it works

DST shifts clocks forward by an hour in spring to move daylight into the evening, then back in autumn. The northern hemisphere typically springs forward around March and falls back around October or November. The southern hemisphere is reversed: it springs forward around September or October and falls back around March or April, because its summer straddles the new year.

Rules are set per country and sometimes per region within a country, and they change over time as governments adopt or abolish DST. The authoritative source is the IANA time zone database, which records every historical and scheduled transition.

Example

The EU switches on the last Sunday of March (forward) and the last Sunday of October (back). The US switches two weeks differently — second Sunday of March and first Sunday of November — so for those two weeks the usual five-hour London to New York gap temporarily becomes four hours.

Notes

This reference describes typical current rules, not guaranteed future ones. Several countries have abolished DST recently, and others have debated it. For any production system, rely on the IANA database through your platform’s time library rather than hardcoding these dates.