KeepTrackOfTime.cs

public class KeepTrackOfTime : Monobehavior
{
    private float seconds;
    private float hours;
    private float minutes;

    private float minutesInSeconds;
    private float hoursInSeconds;
    private float secondsInSeconds; //don't really need this.

    private float totalSeconds;
    private float startTimeInSeconds;

void Start()
    {
        //----------------------------------------
        //USER INPUTS
        //----------------------------------------
        hours = 2;
        minutes = 10;
        seconds = 29;

        //----------------------------------------
        //DO CONVERSIONS -
        //----------------------------------------
        if (hours > 0){hoursInSeconds = 3600 * hours;}else { hoursInSeconds = 0; }
        if (minutes > 0) { minutesInSeconds = 60 * minutes; } else { minutesInSeconds = 0; }
        secondsInSeconds = seconds;

        //Add up the total seconds
        totalSeconds = hoursInSeconds + minutesInSeconds + secondsInSeconds;
        Debug.Log("----------------------------------------");
        }

void Update()
    {
        //Count down the timer---- This will be the textfield for timer.
        totalSeconds -= 1 * Time.deltaTime;
        Debug.Log("----------------------------------------------");
        Debug.Log("Current time: " + totalSeconds.ToString("0"));
     }

}