During the first day of the All-Star break before the Mid-summer Classic to be played in Minneapolis, the Players’ Association sets an August 6th strike date. The union will keep its word, but the season will resume two days later.

On July 15, 1985 During the first day of the All-Star break before the Mid-summer Classic to be played in Minneapolis, the Players’ Association sets an August 6th strike date. The union will keep its word, but the season will resume two days later.

Source
Baseball Reference July 15