Stream of consciousness rationale: The relevant information is: Three years later in June 1979, the NBA adopted the three-point line for a one-year trial for the 1979 -- 80 season, despite the view of many that it was a gimmick.
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Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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Q: Three years later in June 1979, the NBA adopted the three-point line for a one-year trial for the 1979 -- 80 season, despite the view of many that it was a gimmick. Chris Ford of the Boston Celtics is widely credited with making the first three-point shot in NBA history on October 12, 1979; the season opener at Boston Garden was more noted for the debut of Larry Bird (and two new head coaches). Rick Barry of the Houston Rockets, in his final season, also made one in the same game, and Kevin Grevey of the Washington Bullets made one that Friday night as well.

Answer this question based on the passage: when did the nba put in the 3 point line?
A: June 1979