When it is 12:00 PM in Waltham, it is 1:00 AM the next day in Seoul.
📞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.
Waltham is 13 hours behind Seoul.
🕐 Add 13 hours to Waltham time to get Seoul time.
Waltham uses 4 hours behind Universal Time (UTC-4) and Seoul uses 9 hours ahead of Universal Time (UTC+9).
| Waltham Time | Seoul Time | |
|---|---|---|
| 12 AM Waltham Time | ↔ | ☼ 1 PM Seoul Time |
| 1 AM Waltham Time | ↔ | ☼ 2 PM Seoul Time |
| 2 AM Waltham Time | ↔ | ☼ 3 PM Seoul Time |
| 3 AM Waltham Time | ↔ | ☼ 4 PM Seoul Time |
| 4 AM Waltham Time | ↔ | ☼ 5 PM Seoul Time |
| ☼ 5 AM Waltham Time | ↔ | ☼ 6 PM Seoul Time |
| ☼ 6 AM Waltham Time | ↔ | ☼ 7 PM Seoul Time |
| ☼ 7 AM Waltham Time | ↔ | 8 PM Seoul Time |
| ☼ 8 AM Waltham Time | ↔ | 9 PM Seoul Time |
| ☼ 9 AM Waltham Time | ↔ | 10 PM Seoul Time |
| ☼ 10 AM Waltham Time | ↔ | 11 PM Seoul Time |
| ☼ 11 AM Waltham Time | ↔ | 12 AM Seoul Time |
| Waltham Time | Seoul Time | |
|---|---|---|
| ☼ 12 PM Waltham Time | ↔ | 1 AM Seoul Time |
| ☼ 1 PM Waltham Time | ↔ | 2 AM Seoul Time |
| ☼ 2 PM Waltham Time | ↔ | 3 AM Seoul Time |
| ☼ 3 PM Waltham Time | ↔ | 4 AM Seoul Time |
| ☼ 4 PM Waltham Time | ↔ | ☼ 5 AM Seoul Time |
| ☼ 5 PM Waltham Time | ↔ | ☼ 6 AM Seoul Time |
| ☼ 6 PM Waltham Time | ↔ | ☼ 7 AM Seoul Time |
| ☼ 7 PM Waltham Time | ↔ | ☼ 8 AM Seoul Time |
| ☼ 8 PM Waltham Time | ↔ | ☼ 9 AM Seoul Time |
| 9 PM Waltham Time | ↔ | ☼ 10 AM Seoul Time |
| 10 PM Waltham Time | ↔ | ☼ 11 AM Seoul Time |
| 11 PM Waltham Time | ↔ | ☼ 12 PM Seoul Time |
Waltham is 13 hours behind Seoul.
Waltham is behind Seoul by 13 hours.
It is 10:00 PM in Seoul.