Convert Atlantic Time to Mountain Time
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AST · UTC−4 → MST · UTC−7
AST is 3 hours ahead of MST
Halifax · ADT
Wednesday, 7 October 2026
Denver · MDT
Wednesday, 7 October 2026
When are both sides at work?Each column is one hour of the day in the first city; the second row shows the same moment in the other city. Gold means office hours (09:00–18:00), dusk means awake but off work, night means asleep (23:00–07:00). Columns where both rows are gold are good meeting times.
Shared working hours: 12:00–18:00 in Halifax is 09:00–15:00 in Denver.
Working (09–18) Awake, off the clock Asleep (23–07)
Pick a time and share it
08:24 Wed 7 Oct Halifax = 05:24 Wed 7 Oct Denver
Hour-by-hour conversion
| Halifax (AST)Every hour of today in the first city, with the matching time in the second. “Next day” means the calendar date is already tomorrow there. The highlighted row is right now. | Denver (MST) | |
|---|---|---|
| 00:00 | 21:00prev. day | |
| 01:00 | 22:00prev. day | |
| 02:00 | 23:00prev. day | |
| 03:00 | 00:00 | |
| 04:00 | 01:00 | |
| 05:00 | 02:00 | |
| 06:00 | 03:00 | |
| 07:00 | 04:00 | |
| 08:00 | 05:00 | Now |
| 09:00 | 06:00 | |
| 10:00 | 07:00 | |
| 11:00 | 08:00 | |
| 12:00 | 09:00 | Both at work |
| 13:00 | 10:00 | Both at work |
| 14:00 | 11:00 | Both at work |
| 15:00 | 12:00 | Both at work |
| 16:00 | 13:00 | Both at work |
| 17:00 | 14:00 | Both at work |
| 18:00 | 15:00 | |
| 19:00 | 16:00 | |
| 20:00 | 17:00 | |
| 21:00 | 18:00 | |
| 22:00 | 19:00 | |
| 23:00 | 20:00 |
About this conversion
AST here means Atlantic Time, represented by Halifax (America/Halifax), currently UTC−3. MST means Mountain Time, represented by Denver (America/Denver), currently UTC−6.
AST is used by 32 zones, including Canada. If you meant a different one, see every meaning of AST.
MST is used by 4 zones, including United States. See every meaning of MST.
Working hours are shown as 09:00–18:00 local, and sleeping hours as 23:00–07:00. The hour table is anchored on the current day in Halifax; day boundaries are marked where the date differs.
Quick answers
- 09:00 AST is 06:00 MST
- 12:00 AST is 09:00 MST
- 15:00 AST is 12:00 MST
- 18:00 AST is 15:00 MST
Related conversions
- Atlantic Time to Mauritius TimeAST → MUT
- Atlantic Time to Malaysia TimeAST → MYT
- Atlantic Time to New Zealand TimeAST → NZST
- Atlantic Time to Turkmenistan TimeAST → TMT
- Australian Western Time to Mountain TimeAWST → MST
- Azerbaijan Time to Mountain TimeAZT → MST
- Cocos Islands Time to Mountain TimeCCT → MST
- French Guiana Time to Mountain TimeGFT → MST
- Atlantic Time to India TimeAST → IST
- India Time to Mountain TimeIST → MST
- Time in Halifaxnow, DST, offset
- Time in Denvernow, DST, offset