Wintergrasp timer shows the time left for the start of the next Wintergrasp battle. It can be customized to only show the timer when you are in certain zones (for instance Dalaran, by default).

Without any argument, displays the time for next wintergrasp battle

show/hide: show or hide the panel (until you move to another declared zone)
show all: (toggle) show in all zones
hide instances: (toggle) hide panel in instances
hide wintergrasp: (toggle) hide panel in wintergrasp
config: show the current configuration
always on/always off: always/never show the panel
add/remove: add/remove the current zone to the shown list
enable/disable/toggle: enable/disable this add-on
scale VALUE: cale the panel (0.1 - 3.0)
reset: reset values to default