5am JST is 4:00 pm EST the previous day
5am JST is 4:00 pm EDT in Eastern Time, on the previous day. EST is 13 hours behind JST today, and that gap changes during the year, so this is recomputed rather than assumed.
What time is 5am JST in EST?
It is 4:00 pm. Eastern is 13 hours behind Japan, so you subtract 13 hours from 5:00 am and the result lands on the previous day. 5am is early morning in Japan, alarms, commutes and the first coffee, while 4:00 pm is afternoon in Eastern, the second half of the working day.
ISO 8601 would write this instant as 2026-09-24 20:00Z, the same moment expressed with no zone opinion at all. Both 5am JST and 4:00 pm EST are local readings of that one instant, which is the only thing either clock is really describing.
5am JST to EST in the hours either side
The four hours before and after 5am, in case the meeting moves. The whole window stays on the previous day in Eastern, so only the hour changes.
| JST | EST | EST date | Working hours |
|---|---|---|---|
| 1:00 am | 12:00 pm | the previous day | EST only |
| 2:00 am | 1:00 pm | the previous day | EST only |
| 3:00 am | 2:00 pm | the previous day | EST only |
| 4:00 am | 3:00 pm | the previous day | EST only |
| 5:00 am (this page) | 4:00 pm | the previous day | EST only |
| 6:00 am | 5:00 pm | the previous day | neither |
| 7:00 am | 6:00 pm | the previous day | neither |
| 8:00 am | 7:00 pm | the previous day | neither |
| 9:00 am | 8:00 pm | the previous day | JST only |
Is 5am JST a good time to call EST?
It works for them, not obviously for you. 4:00 pm is a normal working hour in Eastern, but 5am is early morning in Japan, alarms, commutes and the first coffee. Expect to be the one making the compromise.
Does daylight saving change 5am JST to EST?
Yes. Sampled at 5am on every day of 2026, the gap takes 2 different values. Today it is 13 hours, which is why the answer above is dated rather than fixed.
Japan Standard Time does not move its clocks at all, so its UTC+9 offset holds every day of the year.
Eastern Time is currently on EDT and changes next on Sunday, November 1, 2026, when the clock falls back from 1:59 am to 1:00 am and the offset moves from UTC-4 to UTC-5.
5am EST to JST, the other way round
Running the question the other way is a different conversion, not a mirror image, because the two zones can be in different daylight saving states on the same date. 5am EST is 6:00 pm JST, which is a different reading from the answer above, because the two directions are separate questions. One wrinkle worth knowing: EST and EDT are two names for the same zone, not two zones. Eastern Time reads EST in winter and EDT in summer. When somebody types "jst to est" they nearly always mean the zone rather than the literal winter offset, so this page resolves JST to Asia/Tokyo and EST to America/New_York and applies whichever offset is genuinely in force on the day.
Questions
- What is 5am JST in EST?
- 4:00 pm EST, the previous day.
- Does 5am JST cross into another date in EST?
- Yes. It lands on Thursday, September 24, 2026, the previous day.
- Is 5am JST always 4pm EST?
- No. The gap moves during the year, between 13 hours and 14 hours. Today it is 13 hours.
- What is 5am JST in UTC?
- 20:00 UTC, because JST is currently UTC+9.
- Can I call Eastern at that hour?
- 4:00 pm is outside the 9 to 5 working day in Eastern.
Other hours on this pair
JST to EST full conversion table · EST to JST · 5am EST to JST · All timezone conversions
12 and 24 hour converter · 8 hours from now · Today · Day counter