| Sg | Pl | |
| Nom | dagr | dagar (rule) |
| Acc | dag (rule) | daga (rule) |
| Dat | dagi (rule) | dögum (rule) |
| Gen | dags (rule) | daga (rule) |
| Sg | Pl | |
| Nom | dagrinn (rule) | dagarnir (rule) |
| Acc | daginn (rule) | dagana (rule) |
| Dat | daginum (rule) | dögunum (rule) |
| Gen | dagsins (rule) | daganna (rule) |