| date | entity | event | name |
|---|---|---|---|
| 20/10/2013 | file format | date released | Universal Windows Platform apps |
| 20/10/1995 | conflict | data start | 1995 Rijeka bombing |
| 20/10/1820 | observatory | date founded | Royal Observatory, Cape of Good Hope |
| 20/10/2012 | operating system | date released | LibreCMC |
| 20/10/2014 | operating system | date released | Apple Pay |