CST to JST Converter & Meeting Planner
Quick answer: 9:00 AM CST = 12:00 AM JST (fixed -06:00 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Central Standard Time (CST) and Japan Standard Time (JST)? You need to account for the standard time difference. Japan Standard Time is normally 15 hours ahead of Central Standard Time. Whether you are coordinating between teams in Chicago and Dallas and Tokyo and Osaka, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM CST = 3:00 PM JST. The full 24-hour CST to JST table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM CST = 6:00 AM JST (+1 day).
| CST Time | JST Time |
|---|---|
| 12:00 AM (00:00) | 3:00 PM (15:00) |
| 1:00 AM (01:00) | 4:00 PM (16:00) |
| 2:00 AM (02:00) | 5:00 PM (17:00) |
| 3:00 AM (03:00) | 6:00 PM (18:00) |
| 4:00 AM (04:00) | 7:00 PM (19:00) |
| 5:00 AM (05:00) | 8:00 PM (20:00) |
| 6:00 AM (06:00) | 9:00 PM (21:00) |
| 7:00 AM (07:00) | 10:00 PM (22:00) |
| 8:00 AM (08:00) | 11:00 PM (23:00) |
| 9:00 AM (09:00) | 12:00 AM (00:00)+1 day |
| 10:00 AM (10:00) | 1:00 AM (01:00)+1 day |
| 11:00 AM (11:00) | 2:00 AM (02:00)+1 day |
| 12:00 PM (12:00) | 3:00 AM (03:00)+1 day |
| 1:00 PM (13:00) | 4:00 AM (04:00)+1 day |
| 2:00 PM (14:00) | 5:00 AM (05:00)+1 day |
| 3:00 PM (15:00) | 6:00 AM (06:00)+1 day |
| 4:00 PM (16:00) | 7:00 AM (07:00)+1 day |
| 5:00 PM (17:00) | 8:00 AM (08:00)+1 day |
| 6:00 PM (18:00) | 9:00 AM (09:00)+1 day |
| 7:00 PM (19:00) | 10:00 AM (10:00)+1 day |
| 8:00 PM (20:00) | 11:00 AM (11:00)+1 day |
| 9:00 PM (21:00) | 12:00 PM (12:00)+1 day |
| 10:00 PM (22:00) | 1:00 PM (13:00)+1 day |
| 11:00 PM (23:00) | 2:00 PM (14:00)+1 day |
Best time to call Tokyo from Chicago
For most work calls, compare the normal business day in Chicago (CST) with the business day in Tokyo (JST). CST commonly covers North America, Central America, while JST is mainly associated with East Asia.
⚠️ Note: 2026-07-05 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
⚠️ There is no clean same-day business-hours overlap on 2026-07-05. A practical compromise is around 7:00 PM CST, which reaches 9:00 AM JST near the start of their workday.
- DST Safety: CST or JST may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
- Tokyo Stock Exchange (TSE): 09:00-15:00 local time in Tokyo.
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Frequently Asked Questions
What is the time difference between CST and JST?
During standard time, Japan Standard Time is 15 hours ahead of Central Standard Time.
Is CST the same as Central Time (CT)?
Central Time (CT) is the umbrella term for the zone, while CST and CDT refer to its two seasonal offsets. CST (UTC-6) applies during standard time from November through March, and CDT (UTC-5) applies during Daylight Saving Time from March through November.
Does Mexico City use CST?
Mexico City operates on UTC-6, the same offset as CST, but it does not observe Daylight Saving Time following Mexico's elimination of the practice under a 2022 law. This means Mexico City stays at UTC-6 year-round while US and Canadian Central Time cities shift to UTC-5 each summer.
Does Japan observe Daylight Saving Time?
Japan has not observed Daylight Saving Time since 1951, when the practice introduced during the Allied occupation was abolished by the Japanese government. JST has remained fixed at UTC+9:00 ever since, and there is no current legislation to reintroduce DST in Japan.
Is JST the same as Korean Standard Time (KST)?
Yes, South Korea's Korean Standard Time (KST) operates at the same UTC+9:00 offset as JST, and South Korea also does not observe Daylight Saving Time. The two countries share an identical clock year-round, which simplifies scheduling for the significant trade, technology, and cultural exchange between Tokyo and Seoul.