UTC to JST Converter

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

UTC
—
JST
—

UTC and JST are the same time

UTC to JST Conversion Table

UTCJST
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 UTC)

Major UTC Cities
  • UTC Reference
  • London (winter)
  • Reykjavik
  • Accra
  • Abidjan
  • Dakar
Major JST Cities
  • Tokyo
  • Osaka
  • Kyoto
  • Yokohama
  • Sapporo
  • Fukuoka
Time Converter
Convert any two cities
Meeting Planner
Find the best overlap time
World Clock
Current time in 400+ cities

UTC vs JST — Converting to Japan Time

UTC (UTC+0) — The world's primary time standard, used in software, aviation, and international communications.

JST (UTC+9) — Japan Standard Time. Fixed offset with no DST — the same year-round. One of the most stable and developer-friendly time zones globally.

Quick reference: UTC + 9h = JST. UTC midnight = 9 AM JST. UTC noon = 9 PM JST. Japanese business hours (9 AM–6 PM JST) correspond to UTC 00:00–09:00.

Frequently Asked Questions

How do I convert UTC to JST?

To convert UTC to JST, add 9 hours. Examples: 00:00 UTC = 09:00 JST. 06:00 UTC = 15:00 JST. 12:00 UTC = 21:00 JST. 18:00 UTC = 03:00 JST (next day). Japan does not observe Daylight Saving Time, so this +9 hours formula never changes throughout the year.

What is midnight UTC in JST?

00:00 UTC (midnight) is 09:00 JST (9:00 AM Japan Standard Time). UTC midnight marks a new calendar day in UTC, while Tokyo is already 9 hours into its morning. For server logs and API timestamps in UTC, Tokyo time is always 9 hours ahead.

What is JST UTC offset?

JST is UTC+9. Japan Standard Time is fixed at 9 hours ahead of UTC year-round with no exceptions. Japan abolished Daylight Saving Time in 1952 and has not observed it since. The IANA timezone identifier is Asia/Tokyo.

How do developers handle UTC to JST conversion?

In code, UTC to JST is: add 9 hours (32,400 seconds). In JavaScript: new Date().toLocaleString("ja-JP", { timeZone: "Asia/Tokyo" }). In Python: datetime.now(timezone.utc).astimezone(ZoneInfo("Asia/Tokyo")). Since there is no DST, a static +9h offset is always accurate for Japan.