Highlighted rows fall within 09:00–18:00 in both places: 6 shared working hours.
How many hours is CST behind ART?
As abbreviations, ART is always 3 hours ahead of CST: CST is UTC−6 and ART is UTC−3. To convert, add 3 hours.
When the CST to ART time difference changes
For most of the year ART is 2 hours ahead of CST. From 1 November to 31 December 2026, ART 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
ART 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
Calling hours for CST and ART
When ART is 2 hours ahead of CST: 6 shared office hours, 09:00 to 15:00 in CST (11:00 to 17:00 in ART).
When ART is 3 hours ahead of CST: 5 shared office hours, 09:00 to 14:00 in CST (12:00 to 17:00 in ART).
Frequently asked questions about CST and ART time
How many hours ahead is ART of CST?
ART (UTC−3) is 3 hours ahead of CST (UTC−6).
Does the time difference between CST and ART 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.