Djernis was formerly part of the German Empire. In the German Empire, the place was called Djernis.
The place is now called Diernæs (Haderslev-Diernæs) and belongs to Denmark.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Djernis | German Empire | Hadersleben | before the Versailles Treaty |
| Diernæs | Denmark | Haderslev | after the Versailles Treaty |
| Diernæs (Haderslev-Diernæs) | Denmark | Sønderjylland | 1993 |