| date | entity | event | name |
|---|---|---|---|
| 04/09/2007 | eruption | date | Eruzione dell'Etna del 2007-2009 |
| 04/09/2005 | file format | date released | People Finder Interchange Format |
| 04/09/2001 | file format | date released | Scalable Vector Graphics |
| 04/09/2012 | file system | date released | ReFS |
| 04/09/1998 | airplane | date First flight | Boeing Business Jet |