Highlighted rows fall within 09:00–18:00 in both places: 6 shared working hours.
How many hours is CST behind BRT?
As abbreviations, BRT is always 3 hours ahead of CST: CST is UTC−6 and BRT is UTC−3. To convert, add 3 hours.
When the CST to BRT time difference changes
For most of the year BRT is 2 hours ahead of CST. From 1 November to 31 December 2026, BRT is 3 hours ahead of CST instead, because the two places change their clocks on different dates. Meetings booked by the usual gap land an hour off in those weeks.
Dates
BRT vs CST
Length
1 November 2026 to 31 December 2026
3 hours ahead
61 days
1 January 2027 to 13 March 2027
3 hours ahead
72 days
14 March 2027 to 6 November 2027
2 hours ahead
238 days
7 November 2027 to 31 December 2027
3 hours ahead
55 days
When CST and BRT are both at work
When BRT is 2 hours ahead of CST: 6 shared office hours, 09:00 to 15:00 in CST (11:00 to 17:00 in BRT).
When BRT is 3 hours ahead of CST: 5 shared office hours, 09:00 to 14:00 in CST (12:00 to 17:00 in BRT).
Frequently asked questions about CST and BRT time
How many hours ahead is BRT of CST?
BRT (UTC−3) is 3 hours ahead of CST (UTC−6).
Does the time difference between CST and BRT change?
Yes. It is usually 2 hours ahead, but changes when one side moves its clocks: 3 hours ahead from 1 November to 31 December 2026; 3 hours ahead from 1 January to 13 March 2027.