convert hours:min:sec to TM1637 4 digits

hello!
i am trying to make a simple timer to countdown from 20 min to 0sec. So far, eveything works and i can see that it works as it should using the serial monitor.
My problem is how do i convert the time stamp hours:min:sec to just min and sec so it will “fit” in the TM1637?

#include "Countimer.h"
#include <TM1637Display.h>
#define CLK 2
#define DIO 3

TM1637Display display(CLK, DIO);

Countimer tDown;

boolean timePause = 1;
boolean timePlay = 0;

//button setup
int startButton = 7;//pin bouton
int resetButton = 8;//
int greenLed = 13;//

//debounce
long lastDebounceTime = 0;
long debounceDelay = 30;


void setup()
{
	Serial.begin(9600);
  {
    display.setBrightness(5);
    //display.setSegments(data);
    delay(50);
  }

 pinMode(greenLed, OUTPUT);
  pinMode(startButton, INPUT_PULLUP);
  pinMode(resetButton, INPUT_PULLUP);

    // Count-down timer with 21s
	tDown.setCounter(0, 00, 10, tDown.COUNT_DOWN, tDownComplete);
    // Call print_time2() method every 1s.
	tDown.setInterval(print_time2, 1000);
}

void loop()
{
	tDown.run();

if ( (millis() - lastDebounceTime) > debounceDelay) {  
  if ((digitalRead(startButton) == 0) && timePlay == 0) {
        digitalWrite(greenLed, HIGH);
        timePlay = 1;
        tDown.start();
        lastDebounceTime = millis();
        delay(100);
      }

  if ((digitalRead(startButton) == 0) && timePlay == 1) {
        digitalWrite(greenLed, LOW);
        timePlay = 0;
        tDown.pause();
        lastDebounceTime = millis();
        delay(100);
      } 
      
 if ((digitalRead(resetButton) == 0)) { 
  delay(50);
        digitalWrite(greenLed, LOW);
        timePlay = 0;
        tDown.restart();
        tDown.pause();
        lastDebounceTime = millis();
        delay(100);
      }
    print_time2();
    }
}

void print_time2()
{  
	//Serial.print("tDown: ");
	Serial.println(tDown.getCurrentTime());
 /*
 // This displays the seconds in the last two places
    display.showNumberDecEx(seconds, 0, true, 2, 2);
    // Display the minutes in the first two places, with colon
    display.showNumberDecEx(minutes, 0x80>>3, true, 2, 0);
    //delay(1000);
 */   
}


void tDownComplete()
{
	 digitalWrite(greenLed, HIGH);
      delay(500);
      digitalWrite(greenLed, LOW);
      delay(500);
      digitalWrite(greenLed, HIGH);
      delay(500);
      digitalWrite(greenLed, LOW);
}