This is a timeline of events related to the Digi-Battle card game. Some dates are speculations but I'm pretty sure they're close enough. It's sad to see but the original Digi-Battle cards seem to have only been released for a single year. If you can pinpoint more specific dates or if any of the below information is incorrect then please correct me.
Dates are in format day/month/year and when a specific date is not known it is substituted with "00".
| 20/11/1999 | Upper Deck announce plans to create the Digi-Battle card game with Bandai (reference) |
| 00/02/2000 | Initial release of Digi-Battle, this includes the Starter Set and Booster Set 1 (reference) |
| 23/05/2000 | Digimon World is released along with DW-01 promo (reference) |
| 13/07/2000 | Taco Bell Promos released, promotion ending 09/09/2000 (reference) |
| 15/08/2000 | Upper Deck update their website to announce the release of Booster Set 2 (reference) |
| 02/09/2000 | 03/09/2000 - The Digimon Weekend took place at Universal Studios Hollywood, the only 2 days that the UN-01 Goldramon cards was distributed (reference1) (reference2) |
| 06/10/2000 | Digimon Movie Promos are released alongside the release of Digimon: The Movie |
| 00/10/2000 | DM-01 Omnimon and DM-02 The Miracle 4 are released with action figures as part of the Digimon: The Movie promo campaign (reference1) (reference2) |
| 00/12/2000 | Fox Kids promos FX-08, FX-09 and FX-10 are released in Fox Kids magazine Winter 2000 issue (reference) |
| 06/12/2000 | German Comic Promo DW-01 is released |
| 00/00/2001 | Cereal Promo set releases in the UK (judging by copyright and best before dates on cereal box) |
| 04/05/2001 | Upper Deck remove all traces of Digimon from their website (reference) |
| 28/06/2001 | Unrelated Digimon Digital Card Battle (PS1) is released in the West |