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

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

World Time Zone Map - GIS Geography

Geography of Daylight Saving Time - Geography Realm

US Time Zones, Overview & History - Video & Lesson Transcript

10 Lesser-Known Facts About Time Zones - Listverse

Why do some countries around the world change their timezone every year? - Quora

The International Date Line

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

Why the US kept Daylight Saving Time

Accuracy of the Time Zone Map

Why the US kept Daylight Saving Time

Timezones and time changes in Portugal

Daylight saving time, explained

Daylight Saving Time Could Be Permanent. Many Scientists Don't Want That. - The New York Times

Time zone - Wikipedia