The time is set by pressing one of the buttons located as shown in the figure.
By pressing and holding the button "H" the desired hour of the day is set.
By pressing and holding the button "M" required minutes are set.
By pressing the button "SET" fast rounding time is set. For example, if you click the button "SET", when the clock shows the time between 1:01 and 1:29, it will change to 1:00.