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