York City in 2012 Born in
Pontefract, West Yorkshire, Platt attended
Easingwold School and played for Easingwold Town before joining the
York City youth system in 2004. He joined
Northern Premier League Division One South club
Hucknall Town on
loan in October 2011, making his only appearance as a
substitute against
Stamford before returning to York in November. Later in the 2011–12 season, Platt signed for
Harrogate Town of the
Conference North on loan on 6 March 2012, scoring on his debut later that day with Harrogate's first goal in a 6–2 home win over
Corby Town. He rejoined Harrogate on a three-month loan on 27 September 2012, making his second debut for the club two days later in a 2–2 draw at
Worcester City. His debut came in a 5–1 win at
Corby Town on 2 February 2013. Platt marked his return with Harrogate's opening goal in a 2–0 win away to
Gloucester City on 23 February 2013. having scored three goals in six matches during his third spell with Harrogate. Platt's emergence in the team was praised by Worthington as the "biggest highlight" of York's relegation battle, and having finished his first senior season at York with seven appearances signed a new two-year contract with the club in May 2013.
Harrogate Town Platt rejoined
National League North club Harrogate on a three-month loan on 28 August 2015, and made his debut a day later as a 55th-minute substitute for
Paul Thirlwell in a 1–0 away win over
Chorley. Platt returned to Harrogate on a one-month loan on 27 January 2016, debuting three days later as a 69th-minute substitute for
Brendon Daniels in a 4–3 away defeat to
F.C. United of Manchester. At the end of 2016–17, Platt was released by Harrogate.
Alfreton Town On 16 June 2017, Platt signed for National League North club
Alfreton Town on a one-year contract.
Boston United On 15 May 2019, Platt joined
Boston United.
Darlington Platt moved on to another National League North club,
Darlington, in May 2023. He signed a one-year deal with the option for a further year, and was appointed captain. After the dismissal of manager
Alun Armstrong and assistant
Darren Holloway on 6 September, Platt was one of a group of three senior players tasked with covering managerial duties until an appointment was made. He was almost ever-present throughout the season, and won three player of the year awards, those presented by the away fans, his manager and his fellow players. ==Playing positions==