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.

Daylight saving time 2023: 5 facts about changing the clocks

Daylight Saving Time for countries in 2023 and Daylight Saving Time map for countries and territories 2023-2024

Daylight Saving Time Around the World 2023

Which Country Has the Most Time Zones? - Geography Realm

Chart: Which Countries Change the Clock?

Time Zones in the World: Why Do Countries Change Their Time Zones?

History of time in the United States - Wikipedia

Time zones and daylight saving time - National Research Council Canada

Indiana time zone: A history of changes, daylight-saving time

Daylight saving time 2023: When do we change the clocks in NY