JST to UTC Converter

Japan Standard Time → Coordinated Universal Time · JST is 9 hours ahead of UTC

JST
—
UTC
—

JST and UTC are the same time

JST to UTC Conversion Table

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

Green rows = business hours overlap (9:00 AM – 6:00 PM JST)

Major JST Cities
  • Tokyo
  • Osaka
  • Kyoto
  • Yokohama
  • Sapporo
  • Fukuoka
Major UTC Cities
  • UTC Reference
  • London (winter)
  • Reykjavik
  • Accra
  • Abidjan
  • Dakar
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JST vs UTC — Fixed Offset, No DST

JST (UTC+9) — Japan Standard Time is one of the world's most stable offsets. No DST, no seasonal changes — always exactly 9 hours ahead of UTC.

UTC (UTC+0) — The world's primary time standard, maintained by atomic clocks. All other timezones are defined as offsets from UTC.

For developers and engineers working with Japanese APIs or databases: JST = UTC + 9h. Midnight UTC is 9:00 AM JST. Common in server log analysis and cross-timezone scheduling.

Frequently Asked Questions

What is JST in UTC?

JST (Japan Standard Time) is UTC+9. Japan is 9 hours ahead of UTC at all times. Japan does not observe Daylight Saving Time, making JST one of the most stable and predictable offsets globally — always exactly UTC+9, year-round.

How do I convert JST to UTC?

To convert JST to UTC, subtract 9 hours. For example: 9:00 AM JST = 12:00 AM (midnight) UTC. 6:00 PM JST = 9:00 AM UTC. 12:00 PM (noon) JST = 3:00 AM UTC. Since Japan does not observe DST, this formula never changes.

Why does Japan not observe Daylight Saving Time?

Japan abolished Daylight Saving Time in 1952, after a brief post-WWII experiment. Cultural and practical reasons cited include: Japan's latitude means daylight hours vary less than in Europe or North America; the disruption to train schedules was significant; and public opposition was strong. Japan has not observed DST since.

What is 00:00 UTC in JST?

00:00 UTC (midnight UTC) is 09:00 JST (9:00 AM Japan Standard Time). Server timestamps in UTC+0 are exactly 9 hours behind Tokyo local time. For developers: to convert UTC epoch to JST, add 9 hours (or 32,400 seconds).