| Clue | Source | Date |
|---|---|---|
| Computer problem arising from the change in date at the start of the 21st century | ||
| 1999/2000 computer-crashing problem? (10,3) | ||
| 1999/2000 computer-crashing problem? | The Guardian Quick | 24 Jan 2024 |
| Rollover problem? [1997] | New York Times | 07 Nov 2017 |
| Rollover problem? [1997] | ||
| Hypothetical virus that didn't cause global computer chaos on 1/1/2000 | The Guardian Quick | 31 Jan 2015 |
| Y2K problem | ||
| Y2K problem |