| Calumet City Time | GMT | |
|---|---|---|
| 12:00 AM Friday Calumet City Time (CST) | ↔ | 06:00 AM Friday GMT |
| 01:00 AM Friday Calumet City Time (CST) | ↔ | 07:00 AM Friday GMT |
| 02:00 AM Friday Calumet City Time (CST) | ↔ | 08:00 AM Friday GMT |
| 03:00 AM Friday Calumet City Time (CST) | ↔ | 09:00 AM Friday GMT |
| 04:00 AM Friday Calumet City Time (CST) | ↔ | 10:00 AM Friday GMT |