JST to CST Converter

Japan Standard Time → Central Standard Time · JST is 15 hours ahead of CST

JST
—
CST
—

JST and CST are the same time

JST to CST Conversion Table

JSTCST
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 CST Cities
  • Chicago, IL
  • Houston, TX
  • Dallas, TX
  • Minneapolis, MN
  • Kansas City, MO
  • New Orleans, LA
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JST vs CST — Tokyo to Chicago

JST (UTC+9) — Japan has no DST, always UTC+9. CST (UTC-6) — Central US shifts to CDT (UTC-5) in summer.

The 14–15 hour gap means Tokyo is always on the next calendar day. Async communication is standard for Japan–Central US teams.

Frequently Asked Questions

How many hours is JST ahead of CST?

JST (Japan Standard Time, UTC+9) is 15 hours ahead of CST (Central Standard Time, UTC-6) in US winter. During US CDT (UTC-5), JST is 14 hours ahead. Japan does not observe DST, so the gap only changes when the US shifts clocks.

What is 9 AM JST in CST?

9:00 AM JST (Tokyo) is 6:00 PM CST the previous day. For example, Tuesday 9:00 AM Tokyo = Monday 6:00 PM Chicago. During CDT (US summer), 9:00 AM JST = 7:00 PM CDT previous day.

What is the time difference between Tokyo and Chicago?

Tokyo (JST, UTC+9) is 15 hours ahead of Chicago (CST, UTC-6) in winter, and 14 hours ahead in summer (CDT, UTC-5). Tokyo is always on the next calendar day compared to Chicago.