You do not have to display all of the time. You may choose only to show hours and minutes, or minutes and seconds. Build the format you want using
hh
represents hours;
mm
represents minutes except that
nn
is used to represent minutes when these are the first part of the time displayed;
ss
represents seconds.
:
must be used to separate the components of the time. This is the character which enables Fireworkz to know that it is dealing with a time.