There is no overlap between 09:00–18:00 working days in these two places.
How many hours is CST behind MMT?
As abbreviations, MMT is always 12.5 hours ahead of CST: CST is UTC−6 and MMT is UTC+6:30. To convert, add 12.5 hours.
When the CST to MMT time difference changes
For most of the year MMT is 11.5 hours ahead of CST. From 1 November to 31 December 2026, MMT is 12.5 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
MMT vs CST
Length
1 November 2026 to 31 December 2026
12.5 hours ahead
61 days
1 January 2027 to 13 March 2027
12.5 hours ahead
72 days
14 March 2027 to 6 November 2027
11.5 hours ahead
238 days
7 November 2027 to 31 December 2027
12.5 hours ahead
55 days
Best time for a meeting between CST and MMT
When MMT is 11.5 hours ahead of CST: no shared 09:00 to 17:00 hours; try 07:00 in CST (18:30 in MMT).
When MMT is 12.5 hours ahead of CST: no shared 09:00 to 17:00 hours; try 07:00 in CST (19:30 in MMT).
Frequently asked questions about CST and MMT time
How many hours ahead is MMT of CST?
MMT (UTC+6:30) is 12.5 hours ahead of CST (UTC−6).
Does the time difference between CST and MMT change?
Yes. It is usually 11.5 hours ahead, but changes when one side moves its clocks: 12.5 hours ahead from 1 November to 31 December 2026; 12.5 hours ahead from 1 January to 13 March 2027.