Multiple Global Meanings for CDT
The abbreviation CDT has multiple official meanings across different continents and legal jurisdictions. Below are all recognized global definitions:
Region: North America
Daylight Saving: Observes DST (shifts to CST)
Region: Caribbean (Cuba)
Daylight Saving: Observes DST (shifts to CST)
Technical Specifications & Standards
Official chronometric properties, ISO standards, and international database registry identifiers for Central Daylight Time:
Daylight Saving Time (DST) Transitions
⬆️ Spring Forward (Clocks Advance)
Second Sunday in March at 02:00 AM (Clocks advance to CDT)
⬇️ Fall Back (Clocks Return)
First Sunday in November at 02:00 AM (Clocks return to CST)
Observing Jurisdictions & Subdivisions
4 Sovereign NationsSovereign nations, administrative subdivisions, and regional territories officially operating under CDT:
Regional Subdivisions & Territory Details
Financial Markets & Trading Hours
Moves the American Midwest to UTC-5, matching winter time in New York and running parallel with year-round UTC-5 zones in South America.
Local Hours: 08:30 - 15:00 CDT
UTC Window: 14:00 - 22:00 UTC
Local Hours: 08:30 - 15:15 CDT
UTC Window: 14:00 - 22:00 UTC
Major Cities in CDT
Primary metropolitan centers and financial hubs observing this time zone:
Adoption History & Astronomical Facts
Year Established: 1918
Passed during the First World War to lower domestic lighting demand and free up fuel for manufacturing. While controversial among farming communities who followed the sun rather than clock dials, it remained popular with urban factory workers and department stores.
During summer, clocks in Chicago and Dallas show the exact same hour as Bogota, Colombia and Lima, Peru, even though those South American capitals never change their clocks.
Frequently Asked Questions about CDT
What does CDT stand for?
CDT stands for Central Daylight Time, the summer schedule for the central parts of the US and Canada running at UTC-5.
Is CDT the same as CST?
No. CDT is used in the summer and autumn at UTC-5, while CST is used during winter at UTC-6.
How far apart are CDT and EDT?
CDT is exactly one hour behind Eastern Daylight Time. If a broadcast begins at 8:00 PM EDT, it airs at 7:00 PM CDT.