Arduino split data into 5 strings

Projects Programming
4 
String hour, minute, year, month, day;

void splitData(String string)
{
  hour = string.substring(0, 2);
  minute = string.substring(3, 5);
  year = string.substring(6, 10);
  month = string.substring(11, 13);
  day = string.substring(14);
}

void setup()
{
  Serial.begin(115200);
  delay(200);
  
  splitData("05:13:2021:11:06");
  
  Serial.println(hour + ":" + minute + ", " + year + "/" + month + "/" + day);
}

void loop() {}