When trying to print millis() the serial monitor spits out garbage

When I try to print millis(), the serial monitor spits out garbage.

This is a little sample of the SM:
n⸮6⸮⸮b⸮+⸮⸮W⸮⸮⸮J⸮v⸮>⸮aj⸮3⸮⸮_⸮&⸮⸮R⸮~⸮G⸮s⸮;⸮g⸮/⸮⸮[⸮#⸮⸮O⸮{⸮C⸮ o⸮7⸮

and this is my code:

int endtime = 0;
int starttime = 0;
void setup() {
Serial.begin(9600);
pinMode(13, OUTPUT);

}

void loop() {

digitalWrite(13, LOW);

Serial.print(millis());

delay(100);
}

Start here

I already did that…

adam008:
I already did that…

It doesn’t show.