Convert CST to EST
To convert CST to EST: 9:00 AM CST is 10:00 AM EST. CST is UTC-06:00 and EST is UTC-05:00, so EST is 1 hour ahead of CST, all year.
In Eastern Standard Time
- On a 24-hour clock
- 09:00 CST is 10:00 EST
- The offsets
- CST is UTC-06:00, EST is UTC-05:00
- Difference
- EST is 1 hour ahead of CST
- Date
- Same calendar day.
- This gap holds all year
- Both zones switch on the same dates, so they move together.
- CST is only in force part of the year United States: daylight time starts the second Sunday in March, at 02:00 local time and ends the first Sunday in November, at 02:00 local time (Energy Policy Act of 2005, in force since 2007). In 2026 that is 2026-03-08 to 2026-11-01. Chicago is on CDT between those dates.
- otherwise CDT, UTC-05:00
- Military time zone letters Z (Zulu) is UTC. A to M run east of Greenwich an hour apart, N to Y west, and J is left out. A letter names an offset, so a zone that switches to daylight time changes letter: EST is R, EDT is Q.
- CST is S (Sierra), EST is R (Romeo)
- In every zone
- HST 05:00 AKST 06:00 PST 07:00 AKDT 07:00 MST 08:00 PDT 08:00 CST 09:00 MDT 09:00 EST 10:00 CDT 10:00 EDT 11:00 UTC 15:00 GMT 15:00 BST 16:00 CET 16:00 CEST 17:00 EET 17:00 EEST 18:00 MSK 18:00 IST 20:30 SGT 23:00 HKT 23:00 JST 00:00 AEST 01:00 AEDT 02:00 NZST 03:00 NZDT 04:00
How the Time Zone Converter works
Central Standard Time (CST) is UTC-06:00 and Eastern Standard Time (EST) is UTC-05:00, so converting CST to EST means adding 1 hour to the CST time. EST is 1 hour ahead of CST.
Worked through: 9:00 AM CST is 10:00 AM EST.
The gap between these two does not change during the year. Both switch to daylight saving on the same dates under the United States rule (the second Sunday in March, at 02:00 local time, ending the first Sunday in November, at 02:00 local time), so they move together and the difference between them never does. The daylight-time pairing is the same 1 hour.
One hour forward, and the most common internal conversion in American business, because Chicago, Dallas and Houston all sit here while the head office sits in New York. Both zones switch together so the hour never moves. The thing to watch is the abbreviation: CST is also China Standard Time at UTC+8 and Cuba Standard Time at UTC-5, so a calendar invitation from outside North America saying CST may be thirteen or fourteen hours from where you assumed.
One thing worth stating plainly, because it is the most common mistake in this whole subject: an abbreviation is not a place. CST is Central Standard Time, which Chicago uses only part of the year; the rest of the time it is on CDT at UTC-05:00. EST is likewise only in force for part of the year in New York; otherwise it is EDT at UTC-04:00. If what you have is a city and a date rather than a pair of abbreviations, that is a different question and needs the tz database, not arithmetic. This is also why the shifting designations exist: CT means Central time whichever of the two is in force, and ET means Eastern time whichever of the two is in force. Searching for CT to ET and searching for CST to EST are the same question in two vocabularies, which is why this converter answers both.
Common times for this pair:
- 8:00 AM CST is 9:00 AM EST - 9:00 AM CST is 10:00 AM EST - 3:00 PM CST is 4:00 PM EST - 4:00 PM CST is 5:00 PM EST
Time Zone Converter FAQ
What is the time difference between CST and EST?
EST is 1 hour ahead of CST. CST is UTC-06:00 and EST is UTC-05:00, and both offsets are definitions rather than measurements, so the subtraction is exact.
What time is 9:00 AM CST in EST?
9:00 AM CST is 10:00 AM EST. Add 1 hour and carry the date if it crosses midnight.
Does the difference between CST and EST change with daylight saving?
No. Both switch on the same dates, so they move together and the gap between them stays at 1 hour.
Is there anything specific to this pair worth knowing?
One hour forward, and the most common internal conversion in American business, because Chicago, Dallas and Houston all sit here while the head office sits in New York. Both zones switch together so the hour never moves. The thing to watch is the abbreviation: CST is also China Standard Time at UTC+8 and Cuba Standard Time at UTC-5, so a calendar invitation from outside North America saying CST may be thirteen or fourteen hours from where you assumed.
Someone wrote CST but it is summer. What do they mean?
Almost certainly the zone rather than the abbreviation: Chicago time, which in summer is CDT at UTC-05:00 rather than CST at UTC-06:00. People type the standard-time abbreviation all year round. If an invitation is an hour out from what you calculated, this is why.