CST JSTTime Converter
CST (UTC−6) is currently 15 hours behind JST (UTC+9). Compare live clocks, convert any hour, and find times to meet.
Best time to meet between CST and JST
Best meeting times:
CST: 4:00 PM – 8:00 PM
JST: 7:00 AM – 11:00 AM
Quick answer
When it's in CST, it's the next day in JST.
CST runs 15 hours behind JST. A 9-to-5 workday on one side lands in the other side's evening or night, so the two cities share almost no normal working hours: edge-of-day calls are the trick.
- Time difference
- +15h 00m
- CST
- UTC−6
- JST
- UTC+9
- Best call window
- Outside 9–6
CST to JST conversion table
The next 12 hours in CST and the matching local time in JST. The current hour is highlighted; drag the converter's slider and the table follows.
| CST | JST |
|---|---|
| NOW Thu, Aug 6 |
Fri, Aug 7 |
Thu, Aug 6 |
Fri, Aug 7 |
Thu, Aug 6 |
Fri, Aug 7 |
Thu, Aug 6 |
Fri, Aug 7 |
Thu, Aug 6 |
Fri, Aug 7 |
Thu, Aug 6 |
Fri, Aug 7 |
Thu, Aug 6 |
Fri, Aug 7 |
Thu, Aug 6 |
Fri, Aug 7 |
Thu, Aug 6 |
Fri, Aug 7 |
Fri, Aug 7 |
Fri, Aug 7 |
Fri, Aug 7 |
Fri, Aug 7 |
Fri, Aug 7 |
Fri, Aug 7 |
Daylight saving shifts this gap by up to 1 hour
The difference between CST and JST swings between 14 and 15 hours across the year as each side starts or ends daylight saving. Regions on CST switch to CDT (UTC−5) during daylight saving time. This page always shows the live, DST-aware difference.
Related time zone conversions
Jump straight to another pair: every combination is a live tool, not an article.
From CST
To JST
One source of truth, for you and your AI
This page exposes the same answer as structured data, so when you ask an assistant "what's 9am CST time in JST?", it can cite the exact, DST-aware result, not a stale blog post.
- Schema.org JSON-LD on every converter page
- A machine-readable facts island with time zone identifiers and every possible offset
- Live times in <time datetime> elements with explicit UTC offsets
{
"pair": "CST → JST",
"url": "https://worldclock.pro/en/convert/cst-to-jst",
"from": {
"name": "CST",
"type": "timezone",
"abbreviation": "CST",
"daylightAbbreviation": "CDT",
"iana": "America/Chicago",
"standardUtcOffset": "-06:00",
"daylightUtcOffset": "-05:00",
"referenceCity": "Chicago"
},
"to": {
"name": "JST",
"type": "timezone",
"abbreviation": "JST",
"daylightAbbreviation": null,
"iana": "Asia/Tokyo",
"standardUtcOffset": "+09:00",
"daylightUtcOffset": null,
"referenceCity": "Tokyo"
},
"currentDifferenceMinutes": 900,
"possibleDifferencesMinutes": [
840,
900
],
"note": "Between the regions that use these zones the difference is 14 and 15 hours across the year, depending on daylight saving on each side. The clocks on this page show the named zones themselves, which are fixed."
}
Frequently asked questions
What is the time difference between CST and JST?
CST is currently 15 hours behind JST. CST is on CST (UTC−6) and JST is on JST (UTC+9). The difference can change when either side starts or ends daylight saving time.
Is JST ahead of or behind CST?
JST is currently 15 hours ahead of CST.
When it is 9:00 AM in CST, what time is it in JST?
When it is 9:00 AM on a Thursday in CST, it is 12:00 AM the next day in JST.
Do CST and JST observe daylight saving time?
Regions on CST switch to CDT (UTC−5) during daylight saving time. JST does not observe daylight saving time.
How do I convert CST time to JST time?
Add 15 hours to any time in CST to get the time in JST. This page's converter and 24-hour table do it automatically and stay correct through daylight-saving changes.
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