A timeline of events that constitute the background to X4 including events from previous X games
| New Time (NT) | Earth Time | X-Game | Event |
|---|---|---|---|
| -128 | Earth Scientists Create Jumpgates | ||
| -124 | The Flight of the Winterblossom | ||
| -104 | Terraformer Project Begins | ||
| -71 | Terraformer Project is Terminated | ||
| -25 | The Terraformer Conflict | ||
| 0 | |||
| 130 | First Contact with the Paranid | ||
| 241 | Foundation of the Federation | ||
| 323 | First Contact with the Boron | ||
| 324 | The Boron Campaign | ||
| 328 | Community of Planets is formed | ||
| 514 | 200 Years of Cold War | ||
| 550 | First Contact with Teladi | ||
| 742 | Evolution of the Xenon | ||
| 742 | X: Btf / X: Tension | Arrival of USC X and Kyle Brennan | |
| 763 | First contact with the Kha'ak | ||
| 763 | X2: The Threat | The President's End massacre | |
| 763 | X2: The Threat | The Battle of Omicron Lyrae | |
| 764 |