US Timezone Clock

What is Daylight Saving Time?

Daylight Saving Time (DST) is the practice of setting the clock forward by one hour during the warmer months to extend the evening daylight. This change helps reduce electricity consumption by reducing the need for lighting and heating. In the U.S., DST begins on the second Sunday in March and ends on the first Sunday in November.

U.S. Time Zones Observing Daylight Saving Time

• Eastern Standard Time (EST): Switches to Eastern Daylight Time (EDT) during DST.
• Central Standard Time (CST): Switches to Central Daylight Time (CDT) during DST.
• Mountain Standard Time (MST): Switches to Mountain Daylight Time (MDT) during DST. Note: Most of Arizona does not observe DST.
• Pacific Standard Time (PST): Switches to Pacific Daylight Time (PDT) during DST.
• Alaska Standard Time (AKST): Switches to Alaska Daylight Time (AKDT) during DST.
• Hawaii-Aleutian Standard Time (HAST): Hawaii does not observe DST. Note:The Aleutian Islands do observe DST if they are in the Alaska Time Zone.

Regions Not Observing Daylight Saving Time

While most of the United States observes Daylight Saving Time, there are a few exceptions. These regions maintain the same standard time year-round.

• Hawaii: Does not observe DST due to its tropical latitude.
• Arizona: Most of the state does not observe DST, with the exception of the Navajo Nation. This is primarily due to the state's hot climate.
• U.S. Territories: Territories including American Samoa, Guam, Northern Mariana Islands, Puerto Rico, and the U.S. Virgin Islands do not observe DST.

View Current Time in US States