Prime Timeline
   | Year | 
   Event | 
   | 2040 | 
   
      
         ● [1]
         Television ceases to exist as a form of entertainment. [1]
      
 
 | 
   | 2364 | 
   
      
       
         ● [2]
         The Borg make their first attack on the Federation, destroying several outposts near the Romulan border. The Romulans re-establish diplomatic ties with the Federation. [2]
      
 
       | 
   
Colour key
● - Shows the canon status and reference of the year for this event
References
| # | 
Series | 
Season | 
Source | 
Comment | 
| 1 | 
TNG | 
1 | 
The Neutral Zone | 
Data states that television had gone by this time | 
| 2 | 
TNG | 
1 | 
The Neutral Zone | 
Note that this episode is the foundation of most Star Trek dates - Data states the year as 2364, and it is from this datapoint that the bulk of dates in Star Trek are calculated |