EDT to JST Time Converter
Japan Standard Time (JST) is currently 13 hours ahead of Eastern Daylight Time (EDT). EDT is UTC-4 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 8:00 AM in EDT, which is 8:00 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: EDT 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?
EDT and JST are fixed offsets, so the difference between them never changes.
EDT is UTC-4, the summer counterpart of EST. Eastern North America uses it from March to November.
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 EDT?
JST is currently 13 hours ahead of EDT. EDT and JST are fixed offsets, so the difference between them never changes.
What time is 9:00 AM in EDT in JST?
9:00 AM in EDT is 10:00 PM in JST.
What is the best time for a call between EDT 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 8:00 AM in EDT, which is 8:00 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.