Teams and agents are prohibited from negotiating until that time.
Said one top agent: "There's no point in having to wake up a player in the middle of the night to do a deal."
Under the new collective bargaining agreement, there are hundreds of players without contracts, some who have been bought out, some who haven't received qualifying offers. Teams that are hiring find themselves in a buyer's market with a new CBA that limits how much they can spend.
The start was delayed after clubs and agents complained to the league that they wanted more time to prepare and make final decisions on qualifying offers. The league and players' union had to sign off on the change.
EDIT: Woops, it is not a full day.













