MeanwhileAST to MST converter
Atlantic Time (Halifax) to Mountain Time (Denver, Salt Lake City, Calgary).
MST is 3 h behind AST.
9:00 AM AST = 6:00 AM MST same day
Best time to meet
The best time to meet is between 12:00 PM and 5:00 PM AST, which is 9:00 AM to 2:00 PM MST. Both sides are then inside 9 AM to 5 PM.
AST to MST time table
For 30 Oct 2026. Green rows: both sides between 9 AM and 5 PM.
| AST | MST |
|---|---|
| 12:00 AM AST | 9:00 PM MST previous day |
| 1:00 AM AST | 10:00 PM MST previous day |
| 2:00 AM AST | 11:00 PM MST previous day |
| 3:00 AM AST | 12:00 AM MST |
| 4:00 AM AST | 1:00 AM MST |
| 5:00 AM AST | 2:00 AM MST |
| 6:00 AM AST | 3:00 AM MST |
| 7:00 AM AST | 4:00 AM MST |
| 8:00 AM AST | 5:00 AM MST |
| 9:00 AM AST | 6:00 AM MST |
| 10:00 AM AST | 7:00 AM MST |
| 11:00 AM AST | 8:00 AM MST |
| 12:00 PM AST | 9:00 AM MST |
| 1:00 PM AST | 10:00 AM MST |
| 2:00 PM AST | 11:00 AM MST |
| 3:00 PM AST | 12:00 PM MST |
| 4:00 PM AST | 1:00 PM MST |
| 5:00 PM AST | 2:00 PM MST |
| 6:00 PM AST | 3:00 PM MST |
| 7:00 PM AST | 4:00 PM MST |
| 8:00 PM AST | 5:00 PM MST |
| 9:00 PM AST | 6:00 PM MST |
| 10:00 PM AST | 7:00 PM MST |
| 11:00 PM AST | 8:00 PM MST |
Quick answers
- 9:00 AM AST = 6:00 AM MST
- 12:00 PM AST = 9:00 AM MST
- 3:00 PM AST = 12:00 PM MST
- 5:00 PM AST = 2:00 PM MST
- 9:00 AM MST = 12:00 PM AST
- 12:00 PM MST = 3:00 PM AST
- 5:00 PM MST = 8:00 PM AST
Does the gap change during the year?
Yes, because of daylight saving. Until 1 Nov 2026: MST is 3 h behind AST. From 1 Nov 2026 to 1 Nov 2026: MST is 2 h behind AST. From 1 Nov 2026 to 14 Mar 2027: MST is 3 h behind AST. From 14 Mar 2027 to 14 Mar 2027: MST is 4 h behind AST. From 14 Mar 2027 to 7 Nov 2027: MST is 3 h behind AST.
AST next changes its clocks on 1 Nov 2026 (back 1 h, to UTC−4), then on 14 Mar 2027 (forward 1 h, to UTC−3). MST next changes its clocks on 1 Nov 2026 (back 1 h, to UTC−7), then on 14 Mar 2027 (forward 1 h, to UTC−6).
About AST and MST
AST here means Atlantic Time, the clock in Halifax. Right now it is UTC−3. Strictly, AST is the winter name; in summer these places use ADT. This page follows their real clock all year.
MST here means Mountain Time, the clock in Denver, Salt Lake City, Calgary. Right now it is UTC−6. Strictly, MST is the winter name; in summer these places use MDT. This page follows their real clock all year.
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Coming soonMore conversions
AST to EST AST to CST AST to PST AST to AKST AST to HST AST to NST AST to BRT AST to ART AST to COT AST to CLT AST to UTC AST to GMT AST to BST AST to CET AST to EET AST to MSK AST to TRT AST to SAST AST to WAT AST to EAT AST to GST AST to IRST AST to AFT AST to PKT AST to IST AST to NPT AST to BDT AST to ICT AST to WIB AST to SGT AST to HKT AST to PHT AST to KST AST to JST AST to AWST AST to ACST AST to AEST AST to NZST
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