JST to CST
-15hJST
JSTSOURCECST
CSTGreen rows indicate typical business hours (9 AM - 5 PM)
JST and CST on the World Map
The map below highlights the JST (Japan Standard Time) and CST (Central Standard Time) timezone regions across the globe.
JST – Japan Standard Time
UTC+09:00Japan Standard Time (JST) is the time zone for Japan, 9 hours ahead of UTC.
- •Japan does not observe daylight saving time.
- •Tokyo is the most populous metropolitan area in the world.
- •The Tokyo Stock Exchange operates from 9:00 AM to 3:00 PM JST.
- •JST is 14 hours ahead of EST and 9 hours ahead of GMT.
CST – Central Standard Time
UTC-06:00Central Standard Time (CST) is the time zone for the central United States, Canada, and Mexico, 6 hours behind UTC.
- •CST covers 20 US states fully or partially.
- •Chicago and Houston are the two largest cities in the Central Time Zone.
- •Mexico City, one of the world's most populous cities, operates on CST.
- •CST is 1 hour behind EST and 2 hours ahead of PST.
JST to CST Time Difference – Complete Guide
JST runs on Japan Standard Time (JST) at UTC+09:00. CST runs on Central Standard Time (CST) at UTC-06:00. That puts JST 15 hours behind CST — a difference of -15h at the current offsets.
In practice, when it is 9:00 AM in JST it is 6:00 PM in CST on the previous day. Midnight in JST is 9:00 AM in CST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
JST to CST time conversion table
| JST (JST) | CST (CST) | Day |
|---|---|---|
| 12:00 AM | 9:00 AM | previous day |
| 6:00 AM | 3:00 PM | previous day |
| 7:00 AM | 4:00 PM | previous day |
| 8:00 AM | 5:00 PM | previous day |
| 9:00 AM | 6:00 PM | previous day |
| 12:00 PM | 9:00 PM | previous day |
| 3:00 PM | 12:00 AM | same day |
| 5:00 PM | 2:00 AM | same day |
| 6:00 PM | 3:00 AM | same day |
| 9:00 PM | 6:00 AM | same day |
Why people convert JST to CST time
- Scheduling a call from JST to CST: a 10:00 AM start in JST lands at 7:00 PM in CST the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -15h gap: JST and CST have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in CST is 6:00 PM in JST.
- Watching a live event or market open: JST viewers need 6:00 PM in CST to catch a 9:00 AM start there, and 3:00 PM if the event is anchored to JST.
- Always state the zone abbreviation, not just the hour. "3:00 PM JST" is unambiguous; "3 PM" across a -15h gap is not.
- With a -15h gap there is no shared 9-to-5 window, so alternate the early start: one week JST takes the early slot, the next week CST does.
About JST (Japan Standard Time)
Japan Standard Time (JST) is the standard time zone for all of Japan. Japan does not observe daylight saving time. JST is 9 hours ahead of UTC and 14 hours ahead of EST. The Tokyo Stock Exchange, the world's third largest by market capitalization, operates on JST. South Korea uses the same offset (KST) but it is a distinct time zone.
About CST (Central Standard Time)
Central Standard Time (CST) covers the central region of North America. It is the second most populous time zone in the US, including major cities like Chicago, Houston, and Dallas. CST is also used in Mexico City and much of Central America including Guatemala, Honduras, El Salvador, and Costa Rica. During summer, most of the US and Canada switch to Central Daylight Time (CDT, UTC-05:00), while Mexico and Central American countries generally remain on CST.
Best time to call between JST and CST
With a -15h offset there is no overlap inside a normal 9 AM – 5 PM day. CST opens at 9:00 AM CST, which is 6:00 PM in JST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
JST and CST have no shared working hours because of the -15h gap. Teams need to alternate early starts or rely on asynchronous handovers.
JST is 15 hours behind CST (JST UTC+09:00 → CST UTC-06:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
JST
Does not observe DST
CST
☀ Currently in DST
Standard: UTC-06:00 · DST: UTC-05:00
Clocks fall back on Sun, Nov 1, 2026
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between JST and CST?
JST (JST, UTC+09:00) is 15 hours behind CST (CST, UTC-06:00). The gap is currently -15h.
How do I convert JST time to CST time?
Add -15h to JST local time. For example, 9:00 AM in JST is 6:00 PM in CST (previous day).
What time is it in CST right now?
CST uses CST at UTC-06:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -15h offset from JST.
What is the best time to call CST from JST?
There is no shared working-hours window because of the -15h gap. The closest option is 1:00 PM in JST, which is 10:00 PM in CST.
Which is behind, JST or CST?
JST is 15 hours behind CST. When it is 12:00 PM in JST it is 9:00 PM in CST.
Does daylight saving time affect the JST–CST difference?
Neither zone observes daylight saving time, so the -15h offset between JST and CST is fixed all year.
Which other cities share JST's time zone?
JST also covers Tokyo, Osaka, Yokohama, Nagoya, Sapporo, Kyoto, Kobe, Fukuoka and 1 more.
Which countries use JST, JST's zone?
JST is used in Japan.
Is there a day difference between JST and CST?
Sometimes. The -15h gap is large enough that 8:00 PM or later in JST already falls on the in CST.
What is the time difference between JST and CST?
CST is -15h from JST.
What timezone is JST in?
JST operates on its local timezone.
What timezone is CST in?
CST operates on its local timezone.
Which countries use JST (Japan Standard Time)?
JST is used in Japan.
Does JST observe daylight saving time?
No, JST does not observe daylight saving time and remains at UTC+09:00 year-round.
What are some interesting facts about JST?
Japan does not observe daylight saving time. Tokyo is the most populous metropolitan area in the world.
Which cities are in the CST timezone?
Major cities in the CST timezone include Chicago, Houston, Dallas, San Antonio, Mexico City, Austin, Winnipeg, Memphis.
What is the UTC offset for CST?
Central Standard Time (CST) is at UTC-06:00. During daylight saving time, it shifts to CDT.
What should I know about the CST timezone?
CST covers 20 US states fully or partially. Chicago and Houston are the two largest cities in the Central Time Zone.
When is it midnight in JST, what time is it in CST?
When it is 12:00 AM (midnight) in JST (JST), it is -15h later in CST (CST).
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See every conversion from JST →·See every conversion from CST →