Timer and Stopwatch

#include <LiquidCrystal.h>
#include <Time.h>
#include <Wire.h>
#include "LedControl.h"
int buttonPin1 = 4;
int buttonPin2 = 3;
int buttonPin3 = 2;
int buzzerPin = 13;

int din = 16;
int cs = 15;
int clk = 14;

unsigned long delaytime1=50;
unsigned long delaytime2=50;

int tSeconds = 10, tMinutes = 0, hours = 0;
int centiseconds = 0, sSeconds = 0, sMinutes = 0;

int button1Counter = 0;//allows the buttons to have multiple operations
int button1State = 0;
int lastButton1State = 0;
int button2Counter = 0;
int button2State = 0;
int lastButton2State = 0;

LiquidCrystal lcd (7,8,9,10,11,12);
LedControl lc= LedControl(16,15,14,1);


void columns() {
  for(int col=0;col<8;col++) {
    delay(delaytime2);
    lc.setColumn(0,col,B10100000);
    delay(delaytime2);
    lc.setColumn(0,col,(byte)0);
    for(int i=0;i<col;i++) {
      delay(delaytime2);
      lc.setColumn(0,col,B10100000);
      delay(delaytime2);
      lc.setColumn(0,col,(byte)0);
    }
  }
}
void setup()
{
  lcd.begin (16,2);
  pinMode (buttonPin1, INPUT_PULLUP);
  pinMode (buttonPin2, INPUT_PULLUP);
  pinMode (buttonPin3, INPUT_PULLUP);
  pinMode (buzzerPin, OUTPUT);
  lc.shutdown(0, false);
  lc.setIntensity(0,8);
  lc.clearDisplay(0);
  Serial.begin (9600);
}

void loop()
{
 button1State = digitalRead (buttonPin1);//this section gives the "mode button the ability to have three seperate operations
 Serial.println(button1State);
 if (button1State != lastButton1State)
 {
  if (button1State = HIGH)
  {
    button1Counter++;
    button2Counter = 1;
    delay (200);
  }
 }
 lastButton1State = button1State;
 if (button1Counter > 3)
 {
  button1Counter = 1;
 }
 button2State = digitalRead (buttonPin2);//"start/stop" button the ability to have two seperate functions
 if (button2State != lastButton2State)
 {
  if (button2State = HIGH)
  {
    button2Counter++;
    delay (200);
  }
 }
 lastButton2State = button2State;
 if (button2Counter > 2)
 {
  button2Counter = 1;
  }
  switch (button1Counter)
  {
    case 1:
    lcd.clear();
    lcd.setCursor (2,1);
     lcd.print(":");
    lcd.setCursor(5, 1);
    lcd.print(":");
    timerFunction();
    break;
    case 2:  //if "Mode" is pressed again, the clock switches once more to stopwatchFunction()
    lcd.clear();
    lcd.setCursor(2, 1);
    lcd.print(":");
    lcd.setCursor(5, 1);
    lcd.print(".");
    stopwatchFunction();
    break;
  }
}

void timerFunction()
{
  if(button2Counter == 2)  //if "Start/Stop" is pressed, the timer counts down
  {
    static unsigned long lastTick = 0;
    if (tSeconds > 0)
    {
      if (millis() - lastTick >= 1000)
        {
        lastTick = millis();
        tSeconds--;
        lcdOutput();
      }
     }
    if (tMinutes > 0)
    {
      if (tSeconds <= 0)
      {
        tMinutes--;
        tSeconds = 60;
      }
    }
    if (hours > 0)
    {
      if (tMinutes <= 0)
      {
        hours--;
        tMinutes = 60;
      }
    }
  }
  else  //if "Start/Stop" is unpressed or pressed a second time, display the current time, but don't count down
  {
    lcdOutput();
  }
  if(hours == 00 && tMinutes == 00 && tSeconds == 00)  //when timer ends, the alarm goes off
  {
    button2Counter = 1;
    columns();
    while(digitalRead(buttonPin3) == HIGH)//the alarm will only go off until "Restart" is pressed

    {
      lcd.setCursor(0, 1);
      lcd.print("00:00:00");
      digitalWrite(buzzerPin, HIGH);
      delay(100);
      digitalWrite(buzzerPin, LOW);
      delay(100);
    }
    if(digitalRead(buttonPin3) == LOW)  //when "Restart" is pressed, the timer resets
    {

      hours = 0;  //this part also
      tMinutes = 0;
      tSeconds = 10;
      lcdOutput();
    }
  }
  if(digitalRead(buttonPin3) == LOW && button2Counter == 1)  //resets the timer when "Restart" button is pressed, as long as the timer is NOT running
  {
    hours = 0;  //this part also must be changed when the timer is altered, to match the initial time
    tMinutes = 0;
    tSeconds = 10;
    delay(10);
  }
}

void stopwatchFunction()
{
  lcd.setCursor(6, 1);
  printDigits(centiseconds);
  lcd.setCursor(3, 1);
  printDigits(sSeconds);
  lcd.setCursor(0, 1);
  printDigits(sMinutes);
  if(button2Counter == 2)  //if the "Start/Stop" button is pressed, the time begins running
  {
    delay(5);
    centiseconds++;
  }
  if(digitalRead(buttonPin3) == LOW && button2Counter == 1)  //if the "Restart" button is pressed, as long as the timer is paused, the stopwatch resets to 00:00.00
  {
    centiseconds = 0;
    sSeconds = 0;
    sMinutes = 0;
  }
  if(centiseconds == 100)
  {
    centiseconds = 0;
    sSeconds++;
  }
  if(sSeconds == 60)
  {
    sSeconds = 0;
    sMinutes++;
  }
}

void lcdOutput()
{
   lcd.setCursor(0, 1);
  printDigits(hours);
  lcd.setCursor(3, 1);
  printDigits(tMinutes);
  lcd.setCursor(6, 1);
  printDigits(tSeconds);
  delay(100);
}

void printDigits(int digits)
{
  if(digits < 10)
  {
    lcd.print("0");
    lcd.print(digits);
  }
  else
  {
    lcd.print(digits);
  }
}