Toggle switch to change clock by one hour

You might want to examine this line of code. Please test what happens when edge case h = 12. Your results might not be what you expect.

h_12 = h>=12 ? h-12 : h;

Test Case h = 12

void setup() {
  // put your setup code here, to run once:
  int h_12 = 12;
  int h = 12;
  
  h_12 = h>=12 ? h-12 : h;
  Serial.begin(115200);
  Serial.println(h_12);
}

void loop() {
  // put your main code here, to run repeatedly:

}