There is no overlap between 09:00–18:00 working days in these two places.
How many hours is CST behind MSK?
As abbreviations, MSK is always 9 hours ahead of CST: CST is UTC−6 and MSK is UTC+3. To convert, add 9 hours.
When the CST to MSK time difference changes
For most of the year MSK is 8 hours ahead of CST. From 1 November to 31 December 2026, MSK is 9 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
MSK vs CST
Length
1 November 2026 to 31 December 2026
9 hours ahead
61 days
1 January 2027 to 13 March 2027
9 hours ahead
72 days
14 March 2027 to 6 November 2027
8 hours ahead
238 days
7 November 2027 to 31 December 2027
9 hours ahead
55 days
Best time for a meeting between CST and MSK
When MSK is 8 hours ahead of CST: no shared 09:00 to 17:00 hours; try 09:00 in CST (17:00 in MSK).
When MSK is 9 hours ahead of CST: no shared 09:00 to 17:00 hours; try 08:00 in CST (17:00 in MSK).
Frequently asked questions about CST and MSK time
How many hours ahead is MSK of CST?
MSK (UTC+3) is 9 hours ahead of CST (UTC−6).
Does the time difference between CST and MSK change?
Yes. It is usually 8 hours ahead, but changes when one side moves its clocks: 9 hours ahead from 1 November to 31 December 2026; 9 hours ahead from 1 January to 13 March 2027.