Execution time of multiple observers on one observable

index.js

// Execution time with multiple observers on the same observable
const currentTime$ = new Observable((subscriber) => {
  const currentTime = new Date().toLocaleTimeString();
  subscriber.next(currentTime);
  subscriber.complete();
});

// Observer n°1
currentTime$.subscribe(currentTime => console.log("Current time (Observer 1): ", currentTime));
// Observer n°2
setTimeout( () => {
  currentTime$.subscribe(currentTime => console.log("Current time (Observer 2): ", currentTime));
}, 1000);
// Observer n°3
setTimeout( () => {
  currentTime$.subscribe(currentTime => console.log("Current time (Observer 3): ", currentTime));
}, 2000);

// results
Current time (Observer 1):12:40:04 PM
Current time (Observer 2):12:40:05 PM
Current time (Observer 3):12:40:06 PM