Diletz was formerly part of the German Empire. In the German Empire, the place was called Dílce.
The place is now called Dílce and belongs to Czechoslovakia.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Diletz | Austro-Hungary | Jitschin | before the Treaty of Saint-Germain |
| Dílce | Austro-Hungary | Jitschin | before the Treaty of Saint-Germain |
| Dílce | Czechoslovakia | Jičín | after the Treaty of Saint-Germain |
| Diletz | German Empire | Jitschin | 1939 |
| Dílce | German Empire | Jitschin | 1939 |
| Dílce | Czechoslovakia | Jičín | 1945 |
| Dílce | Czechoslovakia | Východní Čechy | 1992 |