CDT — Central or Cuba Daylight Time
CDT is ambiguous: it stands for 2 different times, both in use today. When a message says “CDT”, the sender’s country usually tells you which one is meant; to be safe, write the UTC offset (for example CDT = UTC−5 or CDT = UTC−4).
- Central Daylight Time · UTC−5 · North America
- Cuba Daylight Time · UTC−4 · Cuba
Central Daylight Time
CDT stands for Central Daylight Time, UTC−5, 5 hours behind UTC. It is used in summer in North America, from the second Sunday in March at 02:00 to the first Sunday in November at 02:00; the rest of the year they use CST (UTC−6).
Countries and territories: United States and Canada.
Zones: America/Chicago, America/Winnipeg.
Cuba Daylight Time
CDT stands for Cuba Daylight Time, UTC−4, 4 hours behind UTC. It is used in summer in Cuba, from the second Sunday in March at 00:00 to the first Sunday in November at 01:00; the rest of the year they use CST (UTC−5).
Countries and territories: Cuba.
Zones: America/Havana.