UTC to JST Time Converter
Japan Standard Time (JST) is currently 9 hours ahead of Coordinated Universal Time (UTC). UTC is UTC+0 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
There is no overlap between 9:00 AM and 5:00 PM office hours in these two zones. Stretching to early mornings and evenings, the workable window runs from 7:00 AM to 12:00 PM in UTC, which is 4:00 PM to 9:00 PM in JST. One side ends up outside normal hours, so alternating who takes the awkward slot is a fair way to handle recurring calls.
Comparing more than two places? The Overlap Zones tool shows working hours for several cities on one grid.
Hour by Hour: UTC 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?
UTC and JST are fixed offsets, so the difference between them never changes.
UTC is the global time standard. It has no daylight saving and never shifts.
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 UTC?
JST is currently 9 hours ahead of UTC. UTC and JST are fixed offsets, so the difference between them never changes.
What time is 9:00 AM in UTC in JST?
9:00 AM in UTC is 6:00 PM in JST.
What is the best time for a call between UTC and JST?
There is no overlap between 9:00 AM and 5:00 PM office hours in these two zones. Stretching to early mornings and evenings, the workable window runs from 7:00 AM to 12:00 PM in UTC, which is 4:00 PM to 9:00 PM in JST. One side ends up outside normal hours, so alternating who takes the awkward slot is a fair way to handle recurring calls.