Press mode button three times
The seconds will flash, press start/stop button to reset it
Press lap/reset button
The minutes will flash, press start/stop button to advance it
Press lap/reset button
The hour will flash, press start/stop button to advance it
Press lap/reset button
The date will flash, press start/stop button to advance it
Press lap/reset button
The month will flash, press start/stop button to advance it
Press lap/reset button
The day of the week will flash, press start/stop button to advance it