Arduino Timer

#define DEFAULT_MONITOR_SPEED 115200

#include <Arduino.h>
#include <string.h>
#include <math.h>

struct Time
{
  unsigned short int days;
  byte hours;
  byte mins;
  byte secs;
  unsigned short int millis;
};

void tickTime(Time &time);

Time time = {0, 0, 0, 0};
unsigned long usTime;

void setup()
{
  Serial.begin(DEFAULT_MONITOR_SPEED);
  usTime = micros();
}

void loop()
{

  if (abs(micros() - usTime) >= 1000)
  {
    tickTime(time);
    usTime = micros();

    // Выводим время каждую мс
    String formattedTime = "Time: ";
    formattedTime.concat(time.days);
    formattedTime.concat("d : ");
    formattedTime.concat(time.hours);
    formattedTime.concat("h : ");
    formattedTime.concat(time.mins);
    formattedTime.concat("m : ");
    formattedTime.concat(time.secs);
    formattedTime.concat("s : ");
    formattedTime.concat(time.millis);
    formattedTime.concat("ms");

    Serial.println(formattedTime);
  }
}

void tickTime(Time &time)
{
  time.millis += 1;

  if (time.hours >= 24)
  {
    time.hours -= 24;
    time.days += 1;
  }

  if (time.mins >= 60)
  {
    time.mins -= 60;
    time.hours += 1;
  }

  if (time.secs >= 60)
  {
    time.secs -= 60;
    time.mins += 1;
  }

  if (time.millis >= 1000)
  {
    time.millis -= 1000;
    time.secs += 1;
  }
}