How do you convert CST to EST?

Use EST = CST + 1 hour. For 21:00 CST that gives 22:00 EST.

What does 21:00 CST actually mean?

It sits between 17 and 23 CST; the table on this page shows how those compare.

21:00 CST to EST

22:00 EST

21:00 Central Standard Time equals 22:00 Eastern Standard Time.

These are standard-time offsets, which never change. What changes is which one a place observes: New York is on EST in winter but EDT (an hour later) during daylight saving, and the UK is on GMT in winter and BST in summer. If you mean "the time in New York right now", use the full converter — it reads live offsets.

How the conversion works

This one is a formula rather than a single multiplier:

EST = CST + 1 hour → 22:00 EST

Going the other way: 22:00 EST to CST.

Convert a different time zone

CST =22:00 EST

Open the full time zone converter for every other unit.

Nearby values

CST	EST
17:00 CST	18:00 EST
18:00 CST	19:00 EST
19:00 CST	20:00 EST
20:00 CST	21:00 EST
22:00 CST	23:00 EST
23:00 CST	00:00 EST

Questions

What is 21:00 CST in EST?: 21:00 CST is 22:00 EST.
How do you convert CST to EST?: Use EST = CST + 1 hour. For 21:00 CST that gives 22:00 EST.
What does 21:00 CST actually mean?: It sits between 17 and 23 CST; the table on this page shows how those compare.