The clock is a heads up display that shows the Greenwich Median Time (GMT) or the Coordinated Universal Time (UTC). This heads up display is important in cases of some Distractions and Diversions that reset at 00:00 UTC or special events that have require players to participate at a specific time and/or place. The clock shows UTC at a 24 hour interval There is the option to turn off the clock under interface settings (displayed on the right side of Warnings Settings and below "Skill targets based XP popups". There are also 2 other options in that interface settings for the display of the clock