User:Struway2/TransferWindow

The transfer window opens the day after a league finishes its playing season, and a club in that league can sign players as soon as it opens. Please see Football League website: Rules: Section 1 - General Definitions:
 * Season means the period of the year commencing on the date of the first League Match and, for each Club, ending immediately after the completion of the Club’s final fixture of the League Competition or, if the Club is participating in the Play-Offs, the final Play-Off match for that Club.

and Section 6 - Players Rule 41.6.2
 * Transfer Window shall mean either:
 * (a) the period commencing at midnight on the last day of the immediately preceding Season (and for the purposes of this Regulation 41.6.2(a) only, those Clubs participating in Play-off matches shall be regarded as having completed their Season notwithstanding their participation in such Play-off matches, but this exception is subject always to Regulation 41.5) and ending at midnight on the 31 August next following; or
 * (b) the period commencing at midnight on the 31 December and ending at midnight on the 31 January next following...

I've used links to the FL rules because they're on an ordinary webpage rather than the PL's 100s of pages of handbook, but for completeness, the Premier League handbook 2014/15 Section A.1.145 page 86 of a very large PDF file defines season as
 * Season means the period commencing on the date of the first League Match on the fixture list of the League’s first team competition and ending on the date of the last.

and Rule V.1 page 207 defines the summer transfer window as
 * The first Transfer Window in any year shall commence at midnight on the last day of the Season and shall end on 31st August next if a Working Day or, if not, on the first Working Day thereafter, at a time to be determined by the Board.