CT to JST Time Converter
JST is 14 hours ahead of CT. The US Central states are currently on CDT (UTC-5:00), and JST is UTC+9:00.
Best Time to Call Between CT and JST
Standard 9-to-5 hours in these two zones never overlap, so someone has to take the call outside their working day. The most workable window is 5:00 PM to 10:00 PM CT, which is 7:00 AM to 12:00 PM JST.
both at work CT only JST only neither — hours along the strip are CT.
Common Times Converted
CT on the left, JST on the right.
CT to JST: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| CT | JST | Working hours |
|---|---|---|
| 12:00 AM | 2:00 PM | JST only |
| 1:00 AM | 3:00 PM | JST only |
| 2:00 AM | 4:00 PM | JST only |
| 3:00 AM | 5:00 PM | — |
| 4:00 AM | 6:00 PM | — |
| 5:00 AM | 7:00 PM | — |
| 6:00 AM | 8:00 PM | — |
| 7:00 AM | 9:00 PM | — |
| 8:00 AM | 10:00 PM | — |
| 9:00 AM | 11:00 PM | CT only |
| 10:00 AM | 12:00 AM next day | CT only |
| 11:00 AM | 1:00 AM next day | CT only |
| 12:00 PM | 2:00 AM next day | CT only |
| 1:00 PM | 3:00 AM next day | CT only |
| 2:00 PM | 4:00 AM next day | CT only |
| 3:00 PM | 5:00 AM next day | CT only |
| 4:00 PM | 6:00 AM next day | CT only |
| 5:00 PM | 7:00 AM next day | — |
| 6:00 PM | 8:00 AM next day | — |
| 7:00 PM | 9:00 AM next day | JST only |
| 8:00 PM | 10:00 AM next day | JST only |
| 9:00 PM | 11:00 AM next day | JST only |
| 10:00 PM | 12:00 PM next day | JST only |
| 11:00 PM | 1:00 PM next day | JST only |
What CT and JST Actually Are
CT — Central Time
Chicago, Houston, Dallas, Mexico City, Winnipeg. Standing at UTC-6:00 as written, and the region does change its clocks, so its live offset moves by an hour twice a year. The next change is on Sunday, November 1, 2026, to CST.
Central Time is the widest US zone by land area, stretching from the Gulf coast to the Canadian border, and it also covers Mexico City.
JST — Japan Standard Time
Tokyo, Osaka, Yokohama, Nagoya, Sapporo. Standing at UTC+9:00 as written, and the region does not change its clocks, so that offset holds all year. Japan does not observe daylight saving, so this offset is fixed year-round.
Japan abolished daylight saving in 1952 and has resisted every attempt to reintroduce it, including a proposal around the 2020 Olympics.
What This Means in Practice
The date changes mid-working-day
For 7 of the eight hours in a normal CT working day, the equivalent JST time falls on a different calendar date. Anything scheduled in that stretch needs the date checked as well as the time, or a Tuesday call quietly becomes a Wednesday one at the other end.
This gap is not fixed
CT changes its clocks and JST does not, so the difference between them moves by an hour twice a year. A recurring meeting set now will drift for one side from Sunday, November 1, 2026 unless someone resets it.
Nearly opposite sides of the clock
At 14 hours apart, one side's morning is the other side's night. Handing work over at the end of a shift usually beats trying to get both parties in the same call.
Major Cities in Each Zone
Cities on CT
Cities on JST
Frequently Asked Questions
What is the time difference between CT and JST?
JST is 14 hours ahead of CT. That is the live figure. Taken strictly as written, the gap between CT and JST is 15 hours — the two differ because at least one of these regions is currently on daylight saving.
What is 9:00 AM CT in JST?
9:00 AM CT is 11:00 PM JST.
What are the best hours to schedule a call between CT and JST?
Standard business hours in these two zones do not overlap at all, so one side has to work outside the 9-to-5. The most workable window is 5:00 PM to 10:00 PM CT, which is 7:00 AM to 12:00 PM JST.
Does the difference between CT and JST change during the year?
Yes. CT observes daylight saving and JST does not, so the gap shifts by an hour at least twice a year. The next clock change is on Sunday, November 1, 2026.
Does JST always mean Japan Standard Time?
Japan does not observe daylight saving, so this offset is fixed year-round.