#define START_DELAY 1000 //1000ms
#define STOP_DELAY 1500  //1500ms

unsigned long ON_oldtime, OFF_oldtime, old_time;
uint8_t ONdelayStart, OFFdelayStart;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(10, INPUT_PULLUP); //to read state of switch. using internal pullup resistor
  pinMode(6, OUTPUT); //output signal to LED

  ONdelayStart = OFFdelayStart = 0;

}

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

  if(digitalRead(10) == LOW){ //switch was turned ON
    if(ONdelayStart == 0){
      ONdelayStart = 1;
      ON_oldtime = millis();
    }

    if(ONdelayStart == 1 && millis()-ON_oldtime >START_DELAY){ //turn ON LED after time has expired
      digitalWrite(6,HIGH);
    }
  }
  else{ //switch is OFF
    if(ONdelayStart == 1){ //was the switch previously ON?
      ONdelayStart = 0;
      OFFdelayStart = 1;
      OFF_oldtime = millis();
    }
    if(OFFdelayStart == 1 && millis()-OFF_oldtime >STOP_DELAY){ ////turn OFF LED after time has expired
      digitalWrite(6,LOW);
      OFFdelayStart = 0;
    }
  }

}