JST to MST Time Converter

JST refers to the Asia/Tokyo timezone, currently ++9 (GMT+9). MST refers to America/Denver, currently --6 (GMT-6). Timezone abbreviation meanings and offsets are calculated live from the IANA tz database, so Daylight Saving Time is always applied correctly.

Key Facts

• JST (Asia/Tokyo): current live offset ++9.
• MST (America/Denver): current live offset --6.
• Time difference is computed from live IANA tzdb offsets and may shift by one hour during DST transitions.