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