Cowntdown Timer1

#include <SPI.h>
#include <TFT_ILI9163C.h>
#include<CountUpDownTimer.h>

#define buttonHoursPin 3
#define buttonMinPin 4
#define buttonStartPin 5
#define relay 14

#define __CS  10
#define __DC  9
#define __RST 8

#define BLACK   0x0000
#define BLUE    0x001F
#define RED     0xF800
#define GREEN   0x07E0
#define CYAN    0x07FF
#define MAGENTA 0xF81F
#define YELLOW  0xFFE0
#define WHITE   0xFFFF

TFT_ILI9163C tft = TFT_ILI9163C(__CS, __DC, __RST);

CountUpDownTimer T(DOWN);

// debounce button timer
long lastDebounceTime = 0;  // the last time the output pin was toggled
const unsigned long debounceDelay = 250;    // the debounce time; increase if the output flickers
const unsigned long interval = 1000;
unsigned long previousInterval = 0;

unsigned int Hours = 0;
unsigned int Min = 0;
const unsigned int add_min = 5; // 5 min

void setup()
{
  Serial.begin(9600);
  pinMode(buttonHoursPin, INPUT_PULLUP);
  pinMode(buttonMinPin, INPUT_PULLUP);
  pinMode(buttonStartPin, INPUT_PULLUP);
  pinMode(relay, OUTPUT);
  digitalWrite(relay,LOW);
  tft.begin();
  tft.setRotation(3);
  tft.setTextSize(3);
  tft.setTextColor(GREEN);
  T.SetTimer(0,0,0); //start at X minute (USE FOR: DOWN ONLY)
}

void loop()
{
 T.Timer(); // run the timer
 if ( (millis() - lastDebounceTime) > debounceDelay)
 {
  if (digitalRead(buttonHoursPin) == LOW)
  {
   Hours++;
   if (Hours >= 4) Hours=0;
   Serial.println(Hours);
   lastDebounceTime = millis();
  }
  if (digitalRead(buttonMinPin) == LOW)
  {
   Min = Min+add_min;
   if (Min >= 60) Min=0;
   Serial.println(Min);
   lastDebounceTime = millis();
  }
  if (digitalRead(buttonStartPin) == LOW)
  {
   T.SetTimer(Hours,Min,20);
   T.StartTimer();
   lastDebounceTime = millis();
  }
 }
  if (T.TimeHasChanged()) // this prevents the time from being constantly shown.
  {
    tft.setCursor(10,15);
    tft.clearScreen();
    tft.print(T.ShowHours());
    tft.print(":");
    tft.print(T.ShowMinutes());
    tft.print(":");
    tft.print(T.ShowSeconds());
    // This DOES NOT format the time to 0:0x when seconds is less than 10.
    // if you need to format the time to standard format, use the sprintf() function.
  }

  unsigned long currentInterval = millis();
  if (currentInterval - previousInterval >= interval)
  {
    previousInterval = currentInterval;
    if(T.ShowHours() > 0 && T.ShowMinutes() > 0 && T.ShowSeconds() > 0)
    {
     Serial.print("relay on :");
    }
    else
     {
      Serial.print("relay off :");
     }
    /* if (T.TimeHasChanged())
    {
     Serial.print("time change :");
     Serial.println(T.TimeHasChanged());
    }
    else
    {
     Serial.println("time not change");
    } */
  }
}