JST to EST Time Converter
Eastern Standard Time (EST) is currently 14 hours behind Japan Standard Time (JST). JST is UTC+9 and EST is UTC-5. 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 9:00 PM to 9:00 PM in JST, which is 7:00 AM to 7:00 AM in EST. 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: JST to EST
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?
JST and EST are fixed offsets, so the difference between them never changes.
JST is UTC+9. Japan has no daylight saving, so this offset 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.
Frequently Asked Questions
How many hours behind is EST compared to JST?
EST is currently 14 hours behind JST. JST and EST are fixed offsets, so the difference between them never changes.
What time is 9:00 AM in JST in EST?
9:00 AM in JST is 7:00 PM in EST on the previous day.
What is the best time for a call between JST and EST?
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 9:00 PM to 9:00 PM in JST, which is 7:00 AM to 7:00 AM in EST. One side ends up outside normal hours, so alternating who takes the awkward slot is a fair way to handle recurring calls.