Daylight saving time and time zones in countries around the world

Only about a third of the world’s countries practice daylight saving time, and the vast majority of them are in Europe.

Time in the United States - Wikipedia

The International Date Line

How Many Time Zones Are in the United States? - WorldAtlas

Why we voted for permanent daylight saving time but don't have it – Orange County Register

Time zone testing considerations - Bug Hunter Sam

What is daylight saving time and which countries are changing their clocks?, Business and Economy News

The Tumultuous History of Daylight Saving Time

Number of time zones in the world - Flytrippers

Do any countries have their own local times? If so, why do most countries follow an international standard time zone? - Quora

Daylight saving time and time zones in countries around the world: Key facts

How permanent daylight saving time would change sunrise and sunset times - The Washington Post

Daylight saving time by country - Wikipedia

Time in Canada - Wikipedia

Is there any other country with time zones more complex than Australia? - Quora

An Economist's Proposal for Abolishing Daylight Saving Time and Reducing the Number of U.S. Time Zones