https://www.w3schools.com/graphics/tryit.asp?filename=trycanvas_clock_start

float r = 0;
float ang;
void setup()
{

size(500,500);  
background(120,120,120);

}
void draw()
{

background(120,120,120);
r = height / 2;
translate(r, r);
for (int num = 1; num < 13;num++)
{
ang = num * 3.14 / 6;
rotate(ang);
translate(0, -r*0.5);
rotate(-ang);
textSize(25);
text(num, 0, 0);
rotate(ang);
translate(0, r*0.5);
rotate(-ang);
}

}