| date | entity | event | name |
|---|---|---|---|
| 15/04/1978 | city | date founded | Sainte-Marie, Quebec |
| 15/04/1646 | temple | date completed | St Mary Magdalene Chapel, Dingli |
| 15/04/1894 | team | date Foundation | BC Sport Kassel |
| 15/04/1912 | team | date Foundation | BK Derby |
| 15/04/2009 | protected area | date founded | Estuaire-de-la-Rivière-Bonaventure Aquatical Reserve |