EST to JST Time Converter
Japan Standard Time (JST) is currently 14 hours ahead of Eastern Standard Time (EST). EST is UTC-5 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 7:00 AM in EST, which is 9:00 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: EST 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?
EST and JST are fixed offsets, so the difference between them never changes.
EST is UTC-5, used across eastern North America in winter. The same region switches to EDT (UTC-4) 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 EST?
JST is currently 14 hours ahead of EST. EST and JST are fixed offsets, so the difference between them never changes.
What time is 9:00 AM in EST in JST?
9:00 AM in EST is 11:00 PM in JST.
What is the best time for a call between EST 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 7:00 AM in EST, which is 9:00 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.