What is AST in JST?
Japan Standard Time is 13 hours ahead
Convert a time
JST — Japan Standard Time
7:00 pm
JST, Fri
- Time in Halifax
- 6:00:44 AM
- Time in Tokyo
- 7:00:44 PM
- Difference
- +13 h
- Next clock change
- March 14, 2027
When the difference changes
Atlantic Time and Japan Standard Time do not change their clocks on the same dates, so the gap between them is not the same all year. Most converters show only today’s figure. These are the periods ahead:
- Now – March 14, 2027Japan Standard Time is 13 hours ahead
- March 14, 2027 – November 7, 2027Japan Standard Time is 12 hours ahead
- November 7, 2027 – onwardsJapan Standard Time is 13 hours ahead
Periods shorter than a day are not listed. Each zone changes at its own local time, so on a date when both move there are a few hours when the gap is briefly something else.
Daylight saving
Atlantic Time
Clocks go forward one hour — 2:00 am becomes 3:00 am local time, and the zone is on ADT after that.
Japan Standard Time
Japan Standard Time stays on JST all year, so its offset from UTC never moves.
AST to JST conversion table
Every hour of Friday, November 13, 2026, converted from Atlantic Time to Japan Standard Time. 13 of the 24 hours fall on a different calendar day in Tokyo, which is marked.
- 12:00 am AST
- 1:00 pm JST
- 1:00 am AST
- 2:00 pm JST
- 2:00 am AST
- 3:00 pm JST
- 3:00 am AST
- 4:00 pm JST
- 4:00 am AST
- 5:00 pm JST
- 5:00 am AST
- 6:00 pm JST
- 6:00 am AST
- 7:00 pm JST
- 7:00 am AST
- 8:00 pm JST
- 8:00 am AST
- 9:00 pm JST
- 9:00 am AST
- 10:00 pm JST
- 10:00 am AST
- 11:00 pm JST
- 11:00 am AST
- 12:00 am JST+1 day
- 12:00 pm AST
- 1:00 am JST+1 day
- 1:00 pm AST
- 2:00 am JST+1 day
- 2:00 pm AST
- 3:00 am JST+1 day
- 3:00 pm AST
- 4:00 am JST+1 day
- 4:00 pm AST
- 5:00 am JST+1 day
- 5:00 pm AST
- 6:00 am JST+1 day
- 6:00 pm AST
- 7:00 am JST+1 day
- 7:00 pm AST
- 8:00 am JST+1 day
- 8:00 pm AST
- 9:00 am JST+1 day
- 9:00 pm AST
- 10:00 am JST+1 day
- 10:00 pm AST
- 11:00 am JST+1 day
- 11:00 pm AST
- 12:00 pm JST+1 day
Scheduling between the two
There is no overlap between a nine-to-six working day in Halifax and one in Tokyo — the gap is too wide. A call has to sit early or late for one side. Early morning in Halifax is the usual compromise, since that is late afternoon or evening in Tokyo.
A note on AST: it can also mean Arabia Standard Time (UTC+3). This page means Atlantic Time.
Atlantic Time (AST) is used in Nova Scotia, New Brunswick and Puerto Rico
Other conversions
- JST to AST
- AST to UTC
- AST to GMT
- AST to EST
- AST to CST
- AST to MST
- AST to PST
- AST to AKST
- AST to HST
- AST to BST
- AST to CET
- AST to IST
- AST to CST (China)
- AST to AEST
- AST to Mexico City
- AST to BRT
- AST to ART
- AST to EET
- AST to WET
- AST to MSK
- AST to TRT
- AST to SAST
- AST to WAT
- AST to EAT
- AST to GST
- AST to PKT
- AST to ICT
- AST to WIB
- AST to SGT
- AST to HKT
- AST to KST
- AST to PHT
- AST to AWST
- AST to ACST
- AST to NZST
- All zones