Clockjumper

Timezone conversion

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

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

MST is currently 15 hours behind JST.

JST • GMT+9 (UTC+9)
2:16 AM
Thursday, Jul 9
MST • MDT (UTC-6)
11:16 AM
Wednesday, Jul 8

Abbreviation disambiguation

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

Interactive converter

12:00PM

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Full JST to MST conversion table

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

Daylight saving and how the gap changes

Around January the JST → MST offset is 16 hours behind JST. Around July it is 15 hours behind JST. 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 MST ahead of or behind JST right now?
MST is currently 15 hours behind JST.
What is the current JST to MST time difference?
Right now the gap is 15 hours behind — MST is 15 hours behind JST.
Does the JST → MST offset change during the year?
Yes. Around January the offset is 16 hours behind JST; around July it is 15 hours behind JST. The converter above always reflects the correct offset for the date you pick.
Does JST observe daylight saving time?
No — Japan Standard Time stays at a fixed UTC offset year-round.
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.
What time is 9 AM JST in MST?
9:00 AM JST is 6:00 PM (previous day) MST.
What time is 12 PM (noon) JST in MST?
12:00 PM JST is 9:00 PM (previous day) MST.
What time is 5 PM JST in MST?
5:00 PM JST is 2:00 AM MST.
When is the best time to schedule a call between JST and MST?
JST and MST 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 JST refer to?
JST refers to Japan Standard Time (IANA: Asia/Tokyo).
What time zone does MST refer to?
MST refers to Mountain Standard Time (US) (IANA: America/Denver).
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)

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