Claim: The summer transfer window of the Belgian football team opened on 1 January 2015, while The transfer window ended on 30 December 2015.
Evidence: The summer transfer window will open on 1 July 2015, although some transfers were announced prior to that date. The transfer window ends on 1 September 2015, although a few completed transfers could still be announced a few days later. 
The winter transfer window opens on 1 January 2015, although a few transfers may take place prior to that date. The window closes at midnight on 2 February 2015 although outgoing transfers might still happen to leagues in which the window is still open.