When JetTask is in Clock Mode, it displays the current time in a small semi-transparent window. You can minimize the window to the Notification Area at the bottom of your screen by unchecking the red tack.
Note that if a task is marked as being In Progress when JetTask is in clock mode, then JetTask will show the timer for the task in progress.
JetTask can be put into clock mode by selecting the clock icon from the Main Window.
New in version 2.1 is the ability to set a timer when JetTask is in Clock Mode. Just right click on the clock and you will see a menu which allows you Start, Pause, or Stop a timer.
For more information see the JetTask 2.1 Release Note.