When it is 12:00 PM in Roundup, it is 3:00 AM the next day in JST.
📞There is no overlap during standard 9-to-5 business hours, so a call may need to be early or late in the day for one side.
Roundup is 15 hours behind JST.
🕐 Add 15 hours to Roundup time to get JST time.
Roundup uses 6 hours behind Universal Time (UTC-6) and JST uses 9 hours ahead of Universal Time (UTC+9).
| Roundup Time | JST Time | |
|---|---|---|
| 12 AM Roundup Time | ↔ | 3 PM JST Time |
| 1 AM Roundup Time | ↔ | 4 PM JST Time |
| 2 AM Roundup Time | ↔ | 5 PM JST Time |
| 3 AM Roundup Time | ↔ | 6 PM JST Time |
| 4 AM Roundup Time | ↔ | 7 PM JST Time |
| 5 AM Roundup Time | ↔ | 8 PM JST Time |
| 6 AM Roundup Time | ↔ | 9 PM JST Time |
| 7 AM Roundup Time | ↔ | 10 PM JST Time |
| 8 AM Roundup Time | ↔ | 11 PM JST Time |
| 9 AM Roundup Time | ↔ | 12 AM JST Time |
| 10 AM Roundup Time | ↔ | 1 AM JST Time |
| 11 AM Roundup Time | ↔ | 2 AM JST Time |
| Roundup Time | JST Time | |
|---|---|---|
| 12 PM Roundup Time | ↔ | 3 AM JST Time |
| 1 PM Roundup Time | ↔ | 4 AM JST Time |
| 2 PM Roundup Time | ↔ | 5 AM JST Time |
| 3 PM Roundup Time | ↔ | 6 AM JST Time |
| 4 PM Roundup Time | ↔ | 7 AM JST Time |
| 5 PM Roundup Time | ↔ | 8 AM JST Time |
| 6 PM Roundup Time | ↔ | 9 AM JST Time |
| 7 PM Roundup Time | ↔ | 10 AM JST Time |
| 8 PM Roundup Time | ↔ | 11 AM JST Time |
| 9 PM Roundup Time | ↔ | 12 PM JST Time |
| 10 PM Roundup Time | ↔ | 1 PM JST Time |
| 11 PM Roundup Time | ↔ | 2 PM JST Time |
Roundup is 15 hours behind JST.
Roundup is behind JST by 15 hours.
It is 12:00 AM the next day in JST.