Clockjumper

Timezone conversion

MST to AST Time — Convert Mountain Standard Time (US) to Atlantic Standard Time

AST is currently 3 hours ahead of MST. This offset stays the same all year — neither zone shifts for daylight saving in a way that changes it.

AST is currently 3 hours ahead of MST.

MST • MDT (UTC-6)
11:14 AM
Wednesday, Jul 8
AST • ADT (UTC-3)
2:14 PM
Wednesday, Jul 8

Abbreviation disambiguation

MST here means Mountain Standard Time (US). Note: Phoenix observes MST year-round (no DST)

AST here means Atlantic Standard Time. Note: major collision: Arabia Standard Time (Asia/Riyadh) — page must disambiguate

Interactive converter

12:00PM

12
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00

Full MST to AST conversion table

MSTAST
12:00 AM3:00 AM
1:00 AM4:00 AM
2:00 AM5:00 AM
3:00 AM6:00 AM
4:00 AM7:00 AM
5:00 AM8:00 AM
6:00 AM9:00 AM
7:00 AM10:00 AM
8:00 AM11:00 AM
9:00 AM12:00 PM
10:00 AM1:00 PM
11:00 AM2:00 PM
12:00 PM3:00 PM
1:00 PM4:00 PM
2:00 PM5:00 PM
3:00 PM6:00 PM
4:00 PM7:00 PM
5:00 PM8:00 PM
6:00 PM9:00 PM
7:00 PM10:00 PM
8:00 PM11:00 PM
9:00 PM12:00 AM(next day)
10:00 PM1:00 AM(next day)
11:00 PM2:00 AM(next day)

Daylight saving and how the gap changes

The MST → AST offset stays constant across the year — neither zone shifts for daylight saving in a way that changes this gap.

Frequently asked questions

Is AST ahead of or behind MST right now?
AST is currently 3 hours ahead of MST.
What is the current MST to AST time difference?
Right now the gap is 3 hours ahead — AST is 3 hours ahead of MST.
Does the MST → AST offset change during the year?
No. Neither Mountain Standard Time (US) nor Atlantic Standard Time shifts for daylight saving in a way that changes this offset — the gap is the same all year.
Does MST observe daylight saving time?
Yes — Mountain Standard Time (US) observes DST, so its UTC offset shifts by 1 hour(s) between winter and summer.
Does AST observe daylight saving time?
Yes — Atlantic Standard Time observes DST, so its UTC offset shifts by 1 hour(s) between winter and summer.
What time is 9 AM MST in AST?
9:00 AM MST is 12:00 PM AST.
What time is 12 PM (noon) MST in AST?
12:00 PM MST is 3:00 PM AST.
What time is 5 PM MST in AST?
5:00 PM MST is 8:00 PM AST.
When is the best time to schedule a call between MST and AST?
The working-hours overlap (09:00–17:00 in both zones) runs roughly 9:00 AM – 2:00 PM MST (≈ 5 hours). Mid-morning MST is usually the safest window for a live call.
What time zone does MST refer to?
MST refers to Mountain Standard Time (US) (IANA: America/Denver).
What time zone does AST refer to?
AST refers to Atlantic Standard Time (IANA: America/Halifax).
Is MST on this page the same as other zones that share the letters "MST"?
On Clockjumper, MST means Mountain Standard Time (US). Disambiguation: Phoenix observes MST year-round (no DST)
Is AST on this page the same as other zones that share the letters "AST"?
On Clockjumper, AST means Atlantic Standard Time. Disambiguation: major collision: Arabia Standard Time (Asia/Riyadh) — page must disambiguate

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