Daylight Saving Time

References & Edit History Related Topics

Images, Videos & Interactives

A vintage blue and white alarm clock with two bells on top sits on a plain yellow background, showing the time as 9:00:22.

Daylight Saving Time

What's the point of Daylight Saving Time?

Map of the United States color-coded by earliest sunrise times under daylight saving scenarios, with time zone boundaries and interactive controls on the left. Cook County, Illinois sunrise and sunset details shown at bottom.

Daylight Saving Time: Media

Should the U.S. keep Daylight Saving Time?

Videos

What's the point of Daylight Saving Time?

What's the point of Daylight Saving Time?

Have you ever wondered what people mean when they say "spring forward" and "fall...

Video: Encyclopædia Britannica, Inc.

Images

A vintage blue and white alarm clock with two bells on top sits on a plain yellow background, showing the time as 9:00:22.

Alarm clock

Should the United States keep Daylight Saving Time?

© kertlis — iStock / Getty Images

Daylight Saving Time

Daylight Saving Time

A 1918 poster announcing Daylight Saving Time in the United States.

Library of Congress, Washington, D.C. (reproduction no. LC-USZC4-10663)

Interactives

Map of the United States color-coded by earliest sunrise times under daylight saving scenarios, with time zone boundaries and interactive controls on the left. Cook County, Illinois sunrise and sunset details shown at bottom.

See what happens if we stop changing time. Use this interactive map to explore sunrise and sunset changes in your city under different time scenarios.

Encyclopædia Britannica, Inc.

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