Clockjumper

Timezone conversion

MST to JST Time — Convert Mountain Standard Time (US) to Japan Standard Time

JST is currently 15 hours ahead of MST. The gap shifts across the year: around January JST is 16 hours ahead of MST, and around July it is 15 hours ahead of MST, because one or both zones observe daylight saving.

JST is currently 15 hours ahead of MST.

MST • MDT (UTC-6)
8:32 AM
Thursday, Sep 10
JST • JST (UTC+9)
11:32 PM
Thursday, Sep 10

Abbreviation disambiguation

MST is Mountain Standard Time (UTC−7). Most of the US Mountain zone switches to MDT (UTC−6) in summer, but Arizona (except the Navajo Nation) stays on MST year-round.

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Full MST to JST conversion table

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

Daylight saving and how the gap changes

Around January JST is 16 hours ahead of MST. Around July it is 15 hours ahead of MST. That swing comes from one or both zones observing daylight saving on different schedules — the converter above always reflects the correct offset for the date you pick.

Frequently asked questions

Is JST ahead of or behind MST right now?
JST is currently 15 hours ahead of MST.
What is the current MST to JST time difference?
Right now the gap is 15 hours — JST is 15 hours ahead of MST.
Does the MST → JST offset change during the year?
Yes. Around January JST is 16 hours ahead of MST; around July it is 15 hours ahead of MST. The converter above always reflects the correct offset for the date you pick.
Does MST observe daylight saving time?
MST is itself the standard-time form. Mountain Standard Time (US) is in force at UTC-7 through the winter months; outside that window the same zone is on MDT (UTC-6).
Does JST observe daylight saving time?
No — Japan Standard Time stays at a fixed UTC offset year-round.
What time is 3 AM MST in JST?
3:00 AM MST is 6:00 PM JST.
What time is 8 AM MST in JST?
8:00 AM MST is 11:00 PM JST.
What time is 9 AM MST in JST?
9:00 AM MST is 12:00 AM (next day) JST.
What time is 10 AM MST in JST?
10:00 AM MST is 1:00 AM (next day) JST.
What time is 11 AM MST in JST?
11:00 AM MST is 2:00 AM (next day) JST.
What time is 12 PM (noon) MST in JST?
12:00 PM MST is 3:00 AM (next day) JST.
What time is 2 PM MST in JST?
2:00 PM MST is 5:00 AM (next day) JST.
What time is 3 PM MST in JST?
3:00 PM MST is 6:00 AM (next day) JST.
What time is 4 PM MST in JST?
4:00 PM MST is 7:00 AM (next day) JST.
What time is 5 PM MST in JST?
5:00 PM MST is 8:00 AM (next day) JST.
What time is 9 PM MST in JST?
9:00 PM MST is 12:00 PM (next day) JST.
What time is 10 PM MST in JST?
10:00 PM MST is 1:00 PM (next day) JST.
When is the best time to schedule a call between MST and JST?
MST and JST have no direct 09:00–17:00 overlap on the same calendar day. Consider early-morning or late-evening slots on one side, or an asynchronous handoff.
What time zone does MST refer to?
MST refers to Mountain Standard Time (US) (IANA: America/Denver).
What time zone does JST refer to?
JST refers to Japan Standard Time (IANA: Asia/Tokyo).
Is MST on this page the same as other zones that share the letters "MST"?
MST is Mountain Standard Time (UTC−7). Most of the US Mountain zone switches to MDT (UTC−6) in summer, but Arizona (except the Navajo Nation) stays on MST year-round.

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