AST to JST converter
JST is 13 hours ahead of AST today. AST (Atlantic Standard Time) - currently UTC−4; JST (Japan Standard Time) - currently UTC+9.
The 09:00-18:00 workdays in AST and JST don't overlap at all, so one side always works early or late. Quick answers: 9 AM AST = 10 PM JST, 12 PM AST = 1 AM JST (next day), 5 PM AST = 6 AM JST (next day).
Convert a time
JST
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Working hours side by side
columns: AST hours PING · 09–18 local MAYBE · 07–09, 18–21 NOT NOW · 21–07Outlined: everyone can be pinged
AST to JST conversion table
| AST | JST | Verdict in JST |
|---|---|---|
| 12 AM · 00:00 | 1 PM · 13:00 | PING |
| 1 AM · 01:00 | 2 PM · 14:00 | PING |
| 2 AM · 02:00 | 3 PM · 15:00 | PING |
| 3 AM · 03:00 | 4 PM · 16:00 | PING |
| 4 AM · 04:00 | 5 PM · 17:00 | PING |
| 5 AM · 05:00 | 6 PM · 18:00 | MAYBE |
| 6 AM · 06:00 | 7 PM · 19:00 | MAYBE |
| 7 AM · 07:00 | 8 PM · 20:00 | MAYBE |
| 8 AM · 08:00 | 9 PM · 21:00 | NOT NOW |
| 9 AM · 09:00 | 10 PM · 22:00 | NOT NOW |
| 10 AM · 10:00 | 11 PM · 23:00 | NOT NOW |
| 11 AM · 11:00 | 12 AM · 00:00 (next day) | NOT NOW |
| 12 PM · 12:00 | 1 AM · 01:00 (next day) | NOT NOW |
| 1 PM · 13:00 | 2 AM · 02:00 (next day) | NOT NOW |
| 2 PM · 14:00 | 3 AM · 03:00 (next day) | NOT NOW |
| 3 PM · 15:00 | 4 AM · 04:00 (next day) | NOT NOW |
| 4 PM · 16:00 | 5 AM · 05:00 (next day) | NOT NOW |
| 5 PM · 17:00 | 6 AM · 06:00 (next day) | NOT NOW |
| 6 PM · 18:00 | 7 AM · 07:00 (next day) | MAYBE |
| 7 PM · 19:00 | 8 AM · 08:00 (next day) | MAYBE |
| 8 PM · 20:00 | 9 AM · 09:00 (next day) | PING |
| 9 PM · 21:00 | 10 AM · 10:00 (next day) | PING |
| 10 PM · 22:00 | 11 AM · 11:00 (next day) | PING |
| 11 PM · 23:00 | 12 PM · 12:00 (next day) | PING |
Cities on AST
America/HalifaxCities on JST
Asia/TokyoOther conversions
All convertersQuestions
What is the time difference between AST and JST?
JST (Japan Standard Time) is 13 hours ahead of AST (Atlantic Standard Time) right now: UTC−4 versus UTC+9.
What is 9 AM AST in JST?
9:00 AM AST is 10 PM JST.
What is 5 PM AST in JST?
5:00 PM AST is 6 AM JST (next day).
Does daylight saving change the AST–JST difference?
Halifax switches between AST; next change Sunday, 14 March 2027 (UTC−4 → UTC−3). JST has no daylight saving; it stays UTC+9 all year.