Hockey is making the move from two 35-minute halves to four 15-minute quarters in an attempt to make the game more appealing for an Olympic audience.
As of 1 September, major FIH events such as the Champions Trophy, Hockey World League Final and Rio 2016 Olympic Games will assume a new format that includes moving to four 15-minute quarters and having 40-second time-outs when a penalty corner is awarded and after a goal is scored.
The official FIH announcement does not mention if all levels of hockey will be expected to adopt the change.
The four quarter model has been tried and implemented by both the Euro Hockey League and Hockey India League.
Overall game time will move from 70 minutes (previously two 35-minute halves) to a 60-minute game with four 15-minute quarters. The additional time-outs for penalty corners and after goals ensures that the new 60-minute format is primarily actual playing time and eliminates the dead time associated with penalty corner set up while allowing for teams to enjoy their goal celebrations.