FAA6.Q Glossary Terms and Acronyms : 01 Glossary Terms - Overview : D Glossary Terms Beginning with D - Overview : .02 Daylight Saving Time (DST) Definition
Daylight Saving Time (DST) Definition
 
Daylight Saving Time (DST) begins, for most of the United States, on the second Sunday of March, and ends on the first Sunday of November.
 
In March, clocks are moved forward from 2:00 a.m. to 3:00 a.m.
 
In November, time reverts to Standard Time, from 2:00 a.m. to 1:00 a.m.
 
DST is not observed in the U.S. and its territories in the following regions:
 
●American Samoa
●Arizona, except for the following FAA offices on the Navajo Nation:
315C
324C
332C
365C
 
NOTE The Navajo Nation in Arizona participates in DST due to its large size and location in three states. Arizona, except the Navajo Nation, is always on Mountain Standard Time.
 
●Guam
●Hawaii
●Northern Mariana Islands
●Puerto Rico
●U.S. Virgin Islands
 
DST begin and end dates are as follows:
 
Year
Begin Date
End Date
2021
March 14
November 7
2022
March 13
November 6
2023
March 12
November 5
2024
March 10
November 3