Derethian days are divided into the following time periods:
| Dawnsong | 6:00 AM |
|---|---|
| Dawnsong-and-Half | 7:30 AM |
| Morntide | 9:00 AM |
| Morntide-and-Half | 10:30 AM |
| Midsong | 12:00 PM |
| Midsong-and-Half | 1:30 PM |
| Warmtide | 3:00 PM |
| Warmtide-and-Half | 4:30 PM |
| Evensong | 6:00 PM |
| Evensong-and-Half | 7:30 PM |
| Gloaming | 9:00 PM |
| Gloaming-and-Half | 10:30 PM |
| Darktide | 12:00 AM |
| Darktide-and-Half | 1:30 AM |
| Foredawn | 3:00 AM |
| Foredawn-and-Half | 4:30 AM |