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JST to AST
Convert JST (Japan Standard Time, UTC+09:00) to AST (Atlantic Standard Time, UTC−04:00). AST is 13 hours behind JST.
JST
—
Japan Standard Time
→
AST
—
Atlantic Standard Time
Convert a specific time
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JST to AST conversion chart (24-hour)
| JST | AST |
|---|---|
| 00:00 | 11:00 −1d |
| 01:00 | 12:00 −1d |
| 02:00 | 13:00 −1d |
| 03:00 | 14:00 −1d |
| 04:00 | 15:00 −1d |
| 05:00 | 16:00 −1d |
| 06:00 | 17:00 −1d |
| 07:00 | 18:00 −1d |
| 08:00 | 19:00 −1d |
| 09:00 | 20:00 −1d |
| 10:00 | 21:00 −1d |
| 11:00 | 22:00 −1d |
| 12:00 | 23:00 −1d |
| 13:00 | 00:00 |
| 14:00 | 01:00 |
| 15:00 | 02:00 |
| 16:00 | 03:00 |
| 17:00 | 04:00 |
| 18:00 | 05:00 |
| 19:00 | 06:00 |
| 20:00 | 07:00 |
| 21:00 | 08:00 |
| 22:00 | 09:00 |
| 23:00 | 10:00 |
JST to AST time conversion
The difference between JST and AST is fixed: AST is 13 hours behind JST. For example, 9:00 AM (09:00) JST is 20:00 AST, and 6:00 PM (18:00) JST is 05:00 AST. The chart above lists the conversion for every hour of the day.
These conversions use each zone’s standard UTC offset — UTC+09:00 for JST (Japan Standard Time) and UTC−04:00 for AST (Atlantic Standard Time) — so the result is exact and does not shift with Daylight Saving Time. To convert a real calendar date between cities with automatic DST handling, use the full time zone converter.