I am using the following code to create a timer that counts up on screen and resets when a key is pressed.

However, when the timer passes the 1 hour mark, the seconds start to accumulate beyond '60'.  They still add to the minutes but don't start again from '0'.  e.g. http://uoregon.edu/~josh/odd_count.jpg

//
// This Button
//

int startingTime;
final String prefix = "This button was last pressed ";

void setup()
{
 size(1280, 854);
 PFont font= loadFont("AmericanTypewriter-24.vlw");
 textFont(font);

 startingTime = millis();
 

}

void draw()
{
 background(#ffffff);

 int seconds = (millis() - startingTime) / 1000;
 int minutes = seconds / 60;
 int hours = minutes / 60;
 int days = hours / 24;
 hours -= days * 24;
 minutes -= hours * 60;
 seconds -= minutes * 60;

 String message = prefix +
GetPlural(days, "day") + " " +
GetPlural(hours, "hour") + " " +
GetPlural(minutes, "minute") + " and " +
GetPlural(seconds, "second") +
" ago.";

 fill(#000000);
 stroke(#0000FF);
 text(message, 200, 400);
//  println(message);



}

String GetPlural(int value, String word)
{
 if (value == 1)
   return value + " " + word;
   return value + " " + word + "s";
 
 
}

void keyPressed(){
    startingTime = millis();
 }

thank you