CST to JST Time Converter
Japan Standard Time (JST) is currently 15 hours ahead of Central Standard Time (CST). CST is UTC-6 and JST is UTC+9. The table below converts every hour of the day between the two, and the call planner shows where working hours line up.
Best Time for a Call
Both sides are inside 9:00 AM to 5:00 PM office hours between 9:00 AM and 5:00 PM in CST, which is 9:00 AM to 5:00 PM in JST.
Comparing more than two places? The Overlap Zones tool shows working hours for several cities on one grid.
Hour by Hour: CST to JST
Rows marked office hours fall between 9:00 AM and 5:00 PM in both places. For a specific date, use the interactive converter.
Does the Difference Change During the Year?
CST and JST are fixed offsets, so the difference between them never changes.
This page covers North American Central Standard Time, UTC-6. The region switches to CDT (UTC-5) in summer. CST can also refer to China Standard Time, which is UTC+8.
JST is UTC+9. Japan has no daylight saving, so this offset never changes.
Frequently Asked Questions
How many hours ahead is JST compared to CST?
JST is currently 15 hours ahead of CST. CST and JST are fixed offsets, so the difference between them never changes.
What time is 9:00 AM in CST in JST?
9:00 AM in CST is 12:00 AM in JST on the next day.
What is the best time for a call between CST and JST?
Both sides are inside 9:00 AM to 5:00 PM office hours between 9:00 AM and 5:00 PM in CST, which is 9:00 AM to 5:00 PM in JST.