Background: Dion Dublin (born 22 April 1969) is an English former footballer and television presenter. Born in Leicester and of Nigerian descent, he was capped four times for England. Dublin started his career as a centre-back with Norwich City, but made his name at Cambridge United as a centre-forward. He had spells with Norwich City, Cambridge United, Manchester United, Coventry City, Millwall, Aston Villa, Leicester City and Celtic.
Context: Having seen Dublin in a cup tie, Manchester United manager Alex Ferguson signed him for PS1 million on 7 August 1992, fighting off competition from Chelsea and Everton. Dublin was something of a surprise purchase for United, after Ferguson had tried to sign Alan Shearer from Southampton but lost out to Blackburn Rovers.  He scored in United's fourth Premier League game of the 1992-93 season, a last minute winner in United's first Premier league victory - 1-0 against Southampton at The Dell. However, on 2 September, he suffered a broken leg against Crystal Palace in a 1-0 win at Old Trafford, after a tackle by Eric Young, and was out of action for six months. By the time he had recovered, however, United had signed Eric Cantona and the Frenchman was firmly established as first choice strike partner to Mark Hughes. United won the league that season for the first time since 1967, but Dublin failed to make the 10 Premier League appearances required to automatically gain a title winner's medal. However, he was given a medal as a result of special dispensation from the Premier League.  In the 1993-94 season, Dublin regained his fitness, but his first team chances were restricted by partnership of Cantona and Hughes. In December 1993, Ferguson agreed a deal with Everton manager Howard Kendall, that would have seen Dublin moving to Goodison Park, but a member of Everton's board of directors, apparently feeling that Dublin was not worth the money Kendall had offered United, intervened to prevent the transfer going through - this incident led directly to Kendall's resignation as Everton manager and Dublin ended up staying at Old Trafford until the end of the season.  He managed five league appearances that season, scoring once in a 3-2 home win over Oldham Athletic in early April. He also managed a further goal in the Football League Cup second round first leg, as United were beaten 2-1 by Stoke City at the Victoria Ground. The goal against Oldham was the only competitive goal that Dublin scored for United at Old Trafford. He was left out of the FA Cup winning team, and failed to make enough appearances to merit another Premier League title winners medal, and shortly after the start of the 1994-95 season, he was sold to Coventry City for PS2 million.
Question: When did he join Manchester United?

Answer:
7 August 1992,