Prime Timeline
   | Year | Event | 
   | 4 billion bc | 
       ● [1]
         The Progenitor species scattered DNA codes on many worlds. The codes were designed to direct evolution on those planets to produce Humanoid intelligences. In addition, a goodwill message was included in the codes. [2] 
         ● [3]
         Q begins a romantic involvement with a female Q. [4]
      
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Colour key
● - Shows the canon status and reference of the year for this event
References
| # | Series | Season | Source | Comment | 
| 1 | TNG | 6 | The Chase | The timeframe would need to be in this region to preceed the development of life on Earth | 
| 2 | TNG | 6 | The Chase | The timeframe would need to be in this region to precede the development of life on Earth | 
| 3 | VOY | 3 | The Q and the Grey | Q said they had been dating for 4 billion years. This date presumes that their relationship took place in a linear fashion, which is not necessarily the case. | 
| 4 | VOY | 3 | The Q and the Grey |  |