Highlighted rows fall within 09:00–18:00 in both places: 6 shared working hours.
How many hours is MST behind BOT?
As abbreviations, BOT is always 3 hours ahead of MST: MST is UTC−7 and BOT is UTC−4. To convert, add 3 hours.
When the MST to BOT time difference changes
For most of the year BOT is 2 hours ahead of MST. From 1 November to 31 December 2026, BOT is 3 hours ahead of MST 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
BOT vs MST
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
Best time for a meeting between MST and BOT
When BOT is 2 hours ahead of MST: 6 shared office hours, 09:00 to 15:00 in MST (11:00 to 17:00 in BOT).
When BOT is 3 hours ahead of MST: 5 shared office hours, 09:00 to 14:00 in MST (12:00 to 17:00 in BOT).
Frequently asked questions about MST and BOT time
How many hours ahead is BOT of MST?
BOT (UTC−4) is 3 hours ahead of MST (UTC−7).
Does the time difference between MST and BOT 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.