Timezone abbreviation
CDT currently resolves here through America/Chicago, where the live offset is -05:00 (CDT). This page expands that into the broader meaning set, top cities, countries, similar labels, and safer exact-zone equivalents.
Last updated Apr 26, 2026. Representative zones, offset ranges, and city usage are refreshed from the current timezone dataset so abbreviation pages stay tied to real zones instead of static boilerplate.
CDT is a North or South American civil-time label, currently 5h behind UTC at -05:00. The label covers 3 IANA zones across 3 countries, with Chicago as the busiest live reference.
The busiest cities using CDT in the current catalog are Chicago, Houston, San Antonio, Dallas, and Fort Worth. The lead live reference on this page is Chicago (America/Chicago), currently at -05:00 (CDT). Those cities are what give CDT its actual feel rather than the abstract offset.
CDT currently shows -05:00, but America/Chicago observes seasonal clock changes — the next transition is around November 1, 2026. That means the offset on this page is a snapshot, not a permanent fact, so long-range scheduling should pin the underlying IANA zone instead of the abbreviation.
Live reference
America/Chicago
Current offset
-05:00 (CDT)
Meanings / zones / countries
1 / 3 / 3
Offset range
UTC-06:00 to UTC-05:00
CDT is a North American mainland-style offset, so it overlaps with the US and Canadian business day. In practice it is read inside North America, where the leading city anchors are Chicago, United States, Houston, United States, and San Antonio, United States.
CDT resolves cleanly in the current dataset, with one dominant meaning across 3 zones and 3 country groups.
CDT shows up on broadcast guides, sports schedules, and inter-state corporate calendars. CDT can also flip to a sibling daylight-saving abbreviation later in the year, so timestamps before and after the change need to be read carefully.
United States sits in Americas, specifically North America. Population 340,110,988, area 9,525,067 km², capital Washington, D.C.. Civic markers behind CDT include English and USD (United States dollar, $).
Chicago is the clearest city-level anchor: Chicago is the most populous city in the U.S. state of Illinois and in the Midwestern United States. Located on the western shore of Lake Michigan, it is the third-most populous city in the United States, with a population of 2.74 million at the 2020 census. The Chicago metropolitan area has 9.41 million residents and is the third-largest metropolitan area in the country. Chicago is the seat of Cook County, the second-most populous county in the U.S.
CDT in the Central Time meaning runs 5h behind UTC through North America, threading zones such as America/Chicago, America/Matamoros, and America/Winnipeg (cities: Chicago, Houston, and San Antonio). Country anchors: United States, Canada, and Mexico.
Central Time
Current reading: CDT at -05:00 in United States.
America/Chicago changes on November 1, 2026 at about 1:03 AM, moving from CST (-06:00) to CST (-06:00).
City anchors include Chicago, Houston, and San Antonio, while country anchors include United States, Canada, and Mexico.
Central Time
Current reading: CDT at -05:00 in Mexico.
America/Matamoros changes on November 1, 2026 at about 1:03 AM, moving from CST (-06:00) to CST (-06:00).
City anchors include Chicago, Houston, and San Antonio, while country anchors include United States, Canada, and Mexico.
Central Time
Current reading: CDT at -05:00 in Canada.
America/Winnipeg changes on November 1, 2026 at about 1:03 AM, moving from CST (-06:00) to CST (-06:00).
City anchors include Chicago, Houston, and San Antonio, while country anchors include United States, Canada, and Mexico.
Live reference zone: America/Chicago (CDT, -05:00)
Leading city in the current dataset: Chicago, United States.
Cities: Chicago, United States, Houston, United States, and San Antonio, United States. Countries: United States, Canada, and Mexico.
Live zones: America/Chicago (-05:00), America/Matamoros (-05:00), and America/Winnipeg (-05:00).
Countries
United States, Canada, Mexico
Top cities
Chicago, Houston, San Antonio, Dallas
United States spans 1 zone (899 cities) under CDT. Visible cities: Chicago, Houston, and San Antonio. Underlying zones: America/Chicago.
Canada runs on a single zone (4 mapped cities) under CDT. Visible cities: Winnipeg, Brandon, and Steinbach. Underlying zones: America/Winnipeg.
Mexico runs on a single zone (6 mapped cities) under CDT. Visible cities: Reynosa, Heroica Matamoros, and Nuevo Laredo. Underlying zones: America/Matamoros.
City anchors for CDT (North America, currently -05:00). Pick a city to drop into a live local clock.
United States
Cities: Chicago, Houston, San Antonio, Dallas
Meaning group: Central Time
Canada
Cities: Winnipeg, Brandon, Steinbach, Kenora
Meaning group: Central Time
Mexico
Cities: Reynosa, Heroica Matamoros, Nuevo Laredo, Ciudad Acuña
Meaning group: Central Time
CDT reads cleanly across the Americas in this dataset, but the same letters can mean different things elsewhere (notably CST, EST, and IST overlap with non-American labels). Pin the IANA zone when the audience is international.
America/Chicago has an upcoming offset change on November 1, 2026. After that point, CDT on this page will read a different UTC offset until the next transition, so any saved timestamp should anchor to the IANA zone rather than the abbreviation.
For precise work, the safest equivalent of CDT is the exact IANA zone used by your city or system. America/Chicago sits at -05:00, behind UTC, which means daily logs in this zone reach a new calendar date after UTC does — relevant for date-aligned reports and billing cutoffs.
Even with one canonical meaning, CDT spans 3 IANA zones — pin to America/Chicago when DST or historical-rule precision matters.
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