Design submitted by Laszlo from Hungary.
This watch design uses only the numbers 1, 2, 4, and 5 to display the time and date in three columns.
The first column on the left shows the hours, middle column shows the minutes x10, and the third column shows the single minutes. Simply add the numbers in each column to read the time. Press the button once and the time is displayed. Press twice and it will show the date.