Timezone conversion
CDT to CST Time — Convert Central Daylight Time (US) to Central Standard Time (US)
CDT and CST both refer to the America/Chicago zone, so there is nothing to convert between them — a clock in that zone shows one time. What differs is what each name describes, not the time it shows.
CDT and CST are two names for the same time zone.
Abbreviation disambiguation
On Clockjumper, CST refers to US Central Standard Time (UTC−6). The same three letters are also used for China Standard Time (UTC+8) and Cuba Standard Time (UTC−5) — check the city or UTC offset to be sure which is meant.
Why there is nothing to convert
CDT and CST both resolve to the America/Chicago zone, so any clock change applies to both at the same moment. Where the names differ is in what they describe — an umbrella zone versus one of its seasonal forms, a city versus the zone it sits in, or two labels for the same offset. The disambiguation notes above spell out which applies here.
Frequently asked questions
- Is CDT the same as CST?
- They refer to the same time zone (America/Chicago), so a clock shows one time for both and there is nothing to convert. The names are not interchangeable in meaning, though — see below.
- Then what is the difference between CDT and CST?
- The difference is in what each name describes rather than what time it shows. One may be an umbrella name for the zone while the other names only its winter or summer form; seasonal forms such as EST and EDT sit one hour apart as offsets but never apply at the same moment. The disambiguation notes on this page say which case this pair is.
- What time zone does CDT refer to?
- CDT refers to Central Daylight Time (US) (IANA: America/Chicago).
- What time zone does CST refer to?
- CST refers to Central Standard Time (US) (IANA: America/Chicago).
- Is CST on this page the same as other zones that share the letters "CST"?
- On Clockjumper, CST refers to US Central Standard Time (UTC−6). The same three letters are also used for China Standard Time (UTC+8) and Cuba Standard Time (UTC−5) — check the city or UTC offset to be sure which is meant.