JST to CST Converter
Understanding JST and CST Time Zones
Japan Standard Time (JST)
Japan Standard Time is observed in undefined and uses the offset UTC+9. Major cities in this time zone include Tokyo, Osaka, Yokohama. This time zone serves a significant global region with important economic and cultural hubs.
Central Standard Time (CST)
Central Standard Time operates at UTC-6, covering undefined. Key cities include Chicago, Houston, Dallas, Minneapolis. The 15-hour backward offset from JST means that when professionals in Tokyo start their workday at 9:00 AM, it is already 6:00 PM in Chicago.
JST is also commonly referred to as Japan time, Tokyo time, Japanese time. CST is also known as Central Time, CT, Chicago time, Texas time. So if you are searching for Japan time to Central Time, this is the same conversion as JST to CST.
Complete JST to CST Conversion Table
The table below shows every two-hour increment converted from Japan Standard Time to Central Standard Time. Business hours (9 AM – 5 PM) are highlighted for easy scheduling reference.
| JST (Japan Standard Time) | CST (Central Standard Time) |
|---|---|
| 12:00 AM (00:00) | 9:00 AM (09:00) (previous day) |
| 2:00 AM (02:00) | 11:00 AM (11:00) (previous day) |
| 4:00 AM (04:00) | 1:00 PM (13:00) (previous day) |
| 6:00 AM (06:00) | 3:00 PM (15:00) (previous day) |
| 8:00 AM (08:00) | 5:00 PM (17:00) (previous day) |
| 10:00 AM (10:00) | 7:00 PM (19:00) (previous day) |
| 12:00 PM (12:00) | 9:00 PM (21:00) (previous day) |
| 2:00 PM (14:00) | 11:00 PM (23:00) (previous day) |
| 4:00 PM (16:00) | 1:00 AM (01:00) |
| 6:00 PM (18:00) | 3:00 AM (03:00) |
| 8:00 PM (20:00) | 5:00 AM (05:00) |
| 10:00 PM (22:00) | 7:00 AM (07:00) |
Times shown in 12-hour and 24-hour format. Last updated 2026-03-09.
Scheduling Between JST and CST
International conference calls between Tokyo, Osaka, Yokohama and Chicago, Houston, Dallas, Minneapolis work best when scheduled during the overlap of both regions' business hours. Rotating meeting times monthly ensures fairness across time zones.
The large 15-hour gap between JST and CST means that finding overlapping working hours requires compromise from at least one side. Consider adopting asynchronous workflows — recorded video updates, shared documents, and time-zone-aware project management tools — to supplement the limited real-time overlap.
Travel Between Tokyo and Chicago
Booking hotels and transportation in Chicago? Double-check whether listed check-in times are in CST (local) or your departure time zone. A common mistake is arriving 15 hours early or late due to unconverted times.
Medical experts recommend allowing approximately one day of adjustment per hour of time difference. For the 15-hour shift between JST and CST, plan for roughly one week of gradual adjustment for optimal performance.
Daylight Saving Time Considerations
When daylight saving time is in effect, the abbreviation changes (e.g., EST becomes EDT, CET becomes CEST). Our converter handles this automatically, but being aware of which version is active helps avoid confusion.
For the JST to CST conversion specifically: JST (UTC+9) does not observe DST, while CST (UTC-6) does observe DST. This means the offset between them changes by one hour seasonally — the usual 15-hour gap becomes 14 or 16 hours during DST transitions.
Related Time Zone Conversions
References & Resources
Frequently Asked Questions
JST (Japan Standard Time) is 15 hours ahead of CST (Central Standard Time). JST is UTC+9 and CST is UTC-6.
When it is 12:00 PM (noon) in JST, it is 9:00 PM (previous day) in CST.
The best overlap for business hours is approximately 6:00 PM to 2:00 AM CST, which corresponds to 9:00 AM to 5:00 PM in JST. Given the large gap, consider alternating between early and late meeting times.
When daylight saving time is in effect, the abbreviation changes (e.g., EST becomes EDT, CET becomes CEST). Our converter handles this automatically, but being aware of which version is active helps avoid confusion.