#define EXE_INTERVAL 1000  //delay time in milli seconds(1000 = 1seconds)

unsigned long lastExecutedMillis = 0; // vairable to save the last executed time

void setup() {
  /*******************
   *  your setup code
   *******************/
}

void loop() {
  unsigned long currentMillis = millis();

  if (currentMillis - lastExecutedMillis >= EXE_INTERVAL) {
    lastExecutedMillis = currentMillis; // save the last executed time

    /******************
     * your code block
     ******************/
  }
}