| date | entity | event | name |
|---|---|---|---|
| 04/01/1929 | observatory | date founded | Asociación Argentina Amigos de la Astronomía |
| 04/01/1996 | organization | date founded | Long Now Foundation |
| 04/01/2001 | organization | date founded | Manipal Foundation |
| 04/01/2002 | organization | date founded | Mongolian Gender Equality Center |
| 04/01/1981 | organization | date founded | National Council on Disability Affairs (Philippines) |