// We'll start by getting the current time.
const now = new Date();
console.log(now);

// You can create a Date object by providing the year, month, day, etc.
// Note that months are 0-indexed in JavaScript (0-11).
const then = new Date(Date.UTC(2009, 10, 17, 20, 34, 58, 651));
console.log(then);

// You can extract the various components of the date value as expected.
console.log(then.getUTCFullYear());
console.log(then.getUTCMonth() + 1); // Adding 1 to get 1-12 range
console.log(then.getUTCDate());
console.log(then.getUTCHours());
console.log(then.getUTCMinutes());
console.log(then.getUTCSeconds());
console.log(then.getUTCMilliseconds());
console.log(then.toUTCString());

// The day of the week (0-6) is also available.
console.log(then.getUTCDay());

// These methods compare two dates, testing if the
// first occurs before, after, or at the same time
// as the second, respectively.
console.log(then < now);
console.log(then > now);
console.log(then.getTime() === now.getTime());

// To get the difference between two dates, subtract them.
// The result is in milliseconds.
const diff = now - then;
console.log(diff);

// We can compute the length of the duration in
// various units.
console.log(diff / (1000 * 60 * 60)); // Hours
console.log(diff / (1000 * 60)); // Minutes
console.log(diff / 1000); // Seconds
console.log(diff); // Milliseconds

// You can add or subtract milliseconds to a date
// to move forwards or backwards in time.
console.log(new Date(then.getTime() + diff));
console.log(new Date(then.getTime() - diff));