The summer transfer window is well underway, with big-money business being completed left, right and centre.But clubs are going to have to make sure they get all of their signings over the line by the time the deadline comes around.Santos to Man United has been one of the biggest deals of the summerGettyAlready this summer, there have been multiple record-breaking £100million-plus transfers made in the Premier League.Elliot Anderson has joined Manchester City, Sandro Tonali has signed for Tottenham and Morgan Rogers is set for Chelsea.However, time will feel like it’s quickly running out for all clubs to get their deals done as the deadline gets closer…When does the transfer window shut?The transfer deadline in England is set for Tuesday, September 1. For the last two windows, the closing time was set for 7pm, but the time will now return to its original later deadline.It means the summer window closes at 11pm on September 1.Clubs can submit deal sheets before the deadline to give themselves a two-hour grace period to complete transfers.This deadline is in place for the Premier League and EFL.In the WSL, the window closes at 11pm on Thursday, September 3.And that’s the same day as the Scottish Premiership, but in Scotland, the deadline is going to be set for 5pm rather than 11pm.England star Anderson has joined Man City for a record-breaking feeGettyWhen is the deadline across Europe?For LaLiga clubs, their summer window shuts at a similar time to in England, with the deadline set for September 1 at 10:59pm.In Italy and Serie A, clubs have until 8pm on the same day.As for the Bundesliga, their deadline is Monday, August 31 at 7pm.When does the winter transfer window open?Once the summer deadline shuts, clubs will not be able to do any more business until the winter window opens.In England, transfers will be possible again from January 1, 2027.The window will run for a month, closing again on February 1 at 11pm.Meanwhile, in the WSL, the winter window will open on January 4 and close exactly a month later on February 4.And in Scotland, their window will open on January 5, closing at 5pm on February 4.