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