The watch has four buttons. The lower left button is labeled MODE on the face of the watch. There are four modes and pressing the MODE button will step through each mode until you return to the mode at the start of the process. Start at the "Normal" timekeeping mode and press the "MODE" button three times until the digital display rightmost two figures for seconds flash.
Press the lower right button labeled RESET until the item you want to change is flashing. Pressing RESET cycles through seconds, minutes, hours, day, month, day of the week in the top sub-dial and then back to seconds again.
When the item you want to change is flashing press the top right button labeled START to step the displayed item to the value you want. When you are satisfied all the settings are correct, press the lower left button marked MODE to return to normal operation.Coleman 40-408 User's Guide