Convert EST to CST
To convert EST to CST: 10:00 AM EST is 9:00 AM CST. EST is UTC-05:00 and CST is UTC-06:00, so CST is 1 hour behind EST, all year.
In Central Standard Time
- On a 24-hour clock
- 10:00 EST is 09:00 CST
- The offsets
- EST is UTC-05:00, CST is UTC-06:00
- Difference
- CST is 1 hour behind EST
- Date
- Same calendar day.
- This gap holds all year
- Both zones switch on the same dates, so they move together.
- EST 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. New York is on EDT between those dates.
- otherwise EDT, UTC-04:00
- 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.
- EST is R (Romeo), CST is S (Sierra)
- 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
Eastern Standard Time (EST) is UTC-05:00 and Central Standard Time (CST) is UTC-06:00, so converting EST to CST means subtracting 1 hour from the EST time. CST is 1 hour behind EST.
Worked through: 10:00 AM EST is 9:00 AM CST.
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.
An hour back, which is the gentlest conversion in the time zone converter and the one most often done without thinking. It is worth thinking about once: because both zones observe daylight saving on the same dates, the gap is constant, but the pairs of names are not. A meeting that was EST to CST in February is EDT to CDT in May, still an hour apart, and a system that stored the abbreviation rather than the offset now has four strings describing one relationship.
One thing worth stating plainly, because it is the most common mistake in this whole subject: an abbreviation is not a place. EST is Eastern Standard Time, which New York uses only part of the year; the rest of the time it is on EDT at UTC-04:00. CST is likewise only in force for part of the year in Chicago; otherwise it is CDT at UTC-05:00. 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: ET means Eastern time whichever of the two is in force, and CT means Central time whichever of the two is in force. Searching for ET to CT and searching for EST to CST are the same question in two vocabularies, which is why this converter answers both.
Common times for this pair:
- 9:00 AM EST is 8:00 AM CST - 10:00 AM EST is 9:00 AM CST - 1:00 PM EST is 12:00 PM CST - 5:00 PM EST is 4:00 PM CST
Time Zone Converter FAQ
What is the time difference between EST and CST?
CST is 1 hour behind EST. EST is UTC-05:00 and CST is UTC-06:00, and both offsets are definitions rather than measurements, so the subtraction is exact.
What time is 10:00 AM EST in CST?
10:00 AM EST is 9:00 AM CST. Subtract 1 hour and carry the date if it crosses midnight.
Does the difference between EST and CST 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?
An hour back, which is the gentlest conversion in the time zone converter and the one most often done without thinking. It is worth thinking about once: because both zones observe daylight saving on the same dates, the gap is constant, but the pairs of names are not. A meeting that was EST to CST in February is EDT to CDT in May, still an hour apart, and a system that stored the abbreviation rather than the offset now has four strings describing one relationship.
Someone wrote EST but it is summer. What do they mean?
Almost certainly the zone rather than the abbreviation: New York time, which in summer is EDT at UTC-04:00 rather than EST at UTC-05:00. People type the standard-time abbreviation all year round. If an invitation is an hour out from what you calculated, this is why.