What does perpetual calendar abcd mean?

A stands for setting, b stands for rising time, c stands for falling time, d stands for alarm clock and e stands for resetting. Press the set move button, and the clock face will start flashing; Then press the set move button, and the month will start flashing; Press the Set Move button again, and the date will start flashing; Press the Set Move button again, and the hour will start flashing; Press the modify button to increase the time up; Press the Set Move button again and the minutes will start flashing. Press the modify button to increase the number of minutes up.