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MST to JST

Convert Mountain Time to Japan Standard Time: the current time on both sides, how far apart they are right now, and an hour-by-hour conversion table.

When it is MDT, it is GMT+9.

JST is 15 hours ahead of MST.

Conversion table

Every hour of the day converted from MST to JST
MSTJST
12:00 AM03:00 PM
01:00 AM04:00 PM
02:00 AM05:00 PM
03:00 AM06:00 PM
04:00 AM07:00 PM
05:00 AM08:00 PM
06:00 AM09:00 PM
07:00 AM10:00 PM
08:00 AM11:00 PM
09:00 AM12:00 AMnext day
10:00 AM01:00 AMnext day
11:00 AM02:00 AMnext day
12:00 PM03:00 AMnext day
01:00 PM04:00 AMnext day
02:00 PM05:00 AMnext day
03:00 PM06:00 AMnext day
04:00 PM07:00 AMnext day
05:00 PM08:00 AMnext day
06:00 PM09:00 AMnext day
07:00 PM10:00 AMnext day
08:00 PM11:00 AMnext day
09:00 PM12:00 PMnext day
10:00 PM01:00 PMnext day
11:00 PM02:00 PMnext day

About daylight saving

These abbreviations name a zone, not a fixed offset. MST is America/Denver and is currently on MDT; JST is Asia/Tokyo and is currently on GMT+9. The gap between them changes on the days each side switches, which is why this page converts through the zones rather than through a stored offset.

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Other conversions

EST → JSTCST → JSTMST → ESTMST → CSTMST → PSTMST → UTCMST → GMTMST → CET

Frequently asked questions

Noon in MST is 03:00 AM JST. The live times are at the top of this page and in the table above.

JST is 15 hours ahead of MST.

Yes, whenever one side starts or ends daylight saving and the other has not yet. The times on this page are computed from the live time-zone rules, so they follow those changes.

JST follows the Asia/Tokyo zone, currently GMT+9.

Planning across these zones?

Create a countdown in either zone, or open the meeting planner to compare several at once.

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