Current Time in IANA CST6CDT Timezone
IANA Name: CST6CDT
Standard Offset: UTC −06:00
Daylight Saving: Yes
DST Offset: UTC −05:00
DST Abbreviation: CDT
Currently Observing DST: Yes ✅
CST6CDT: The Central Time Zone of North America
CST6CDT is an IANA time zone identifier representing the Central Time Zone in North America, which observes Central Standard Time (CST, UTC-06:00) during winter and Central Daylight Time (CDT, UTC-05:00) during summer. This zone covers a vast region including parts of the United States, Canada, and Mexico, as well as several Central American countries. It is one of the most populous time zones in the Americas, with major cities like Chicago, Dallas, and Winnipeg.
Geographic Scope and Usage
The CST6CDT zone applies to a wide swath of North America. In the United States, it covers the entire states of Alabama, Arkansas, Illinois, Iowa, Louisiana, Minnesota, Mississippi, Missouri, Oklahoma, and Wisconsin, plus most of Kansas, Nebraska, North Dakota, South Dakota, Tennessee, and Texas. In Canada, it includes the province of Manitoba and most of Saskatchewan (though Saskatchewan does not observe DST and remains on CST year-round, but its IANA zone is America/Regina). In Mexico, it covers the eastern part of the country, including Mexico City and Monterrey, though Mexico uses different IANA zones like America/Mexico_City. Several Central American countries also use CST year-round without DST: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua. However, these countries are assigned separate IANA zones (e.g., America/Belize, America/Costa_Rica) but share the same standard offset.
Offset and Abbreviation
The standard offset is UTC-06:00, abbreviated as CST (Central Standard Time). During daylight saving time, the offset shifts to UTC-05:00, abbreviated as CDT (Central Daylight Time). The abbreviation CST6CDT literally means "Central Standard Time 6 hours behind UTC, Central Daylight Time" – a legacy naming from the POSIX standard. In practice, the zone switches between CST and CDT twice a year.
Daylight Saving Time Behavior
CST6CDT observes daylight saving time (DST) in accordance with the rules of the United States and Canada. DST begins on the second Sunday of March at 2:00 a.m. local time, when clocks spring forward to 3:00 a.m. CDT. DST ends on the first Sunday of November at 2:00 a.m. CDT, when clocks fall back to 1:00 a.m. CST. Recent and upcoming change dates include: March 9, 2025 (CDT start); November 2, 2025 (CST start); March 8, 2026 (CDT start); November 1, 2026 (CST start). This pattern repeats annually. Note that some regions within the geographic area (like Saskatchewan) do not observe DST, but they are assigned different IANA zones (e.g., America/Regina).
Major Cities and Countries
Key cities in CST6CDT include Chicago (USA), Dallas (USA), Houston (USA), Winnipeg (Canada), and Mexico City (Mexico, though Mexico uses America/Mexico_City). In Central America, cities like San José (Costa Rica), Guatemala City (Guatemala), and Managua (Nicaragua) are on CST year-round. The zone is home to over 100 million people.
Practical Guidance for Business and Scheduling
When scheduling calls across time zones, note that CST6CDT is 1 hour ahead of Mountain Time (UTC-07:00) and 1 hour behind Eastern Time (UTC-05:00). During DST, the offset matches Eastern Time's standard offset. For international calls, CST6CDT is 6 hours behind UTC during standard time and 5 hours behind during DST. Common overlaps: 9:00 a.m. CST (15:00 UTC) aligns with 3:00 p.m. in London (GMT) during winter; during summer, 9:00 a.m. CDT (14:00 UTC) aligns with 3:00 p.m. in London (BST). For Asia, 8:00 a.m. CST (14:00 UTC) is 10:00 p.m. in Beijing (CST, UTC+08:00). Always confirm DST status for both locations.
Frequently Asked Questions
What does CST6CDT stand for?
CST6CDT is a legacy IANA time zone identifier that stands for Central Standard Time (UTC-06:00) and Central Daylight Time (UTC-05:00). The "6" indicates the standard offset of 6 hours behind UTC, and "CDT" is the daylight saving abbreviation.
Which countries use CST6CDT?
CST6CDT is used in parts of the United States, Canada, and Mexico. However, many of these regions have their own IANA zones (e.g., America/Chicago for the US, America/Winnipeg for Canada, America/Mexico_City for Mexico). Central American countries like Belize, Costa Rica, and Guatemala use CST year-round but have separate IANA zones.
Does CST6CDT observe daylight saving time?
Yes, CST6CDT observes DST. Clocks spring forward from CST to CDT on the second Sunday of March and fall back on the first Sunday of November. For example, in 2025, DST starts March 9 and ends November 2.
What is the time difference between CST6CDT and UTC?
During standard time (CST), the offset is UTC-06:00. During daylight time (CDT), the offset is UTC-05:00.
Is CST6CDT the same as America/Chicago?
No, but they are closely related. America/Chicago is the preferred IANA zone for most of the US Central Time region. CST6CDT is a legacy alias that may still appear in some systems. Both observe the same offsets and DST rules.
What major cities are in CST6CDT?
Major cities include Chicago, Dallas, Houston, Minneapolis, St. Louis, and Winnipeg. In Mexico, Mexico City and Monterrey are in the same offset but use America/Mexico_City.