The article is super weird. It never mentions Date.now(). It dances around the subject and exhaustively mentions the equivalent convention for Temporal.

If you want Date to act like Temporal then only use Date.now() as your starting point. It generates the number of milliseconds since 1 Jan 1970. That means the starting output is a number type in integer form. It does not represent a static value, but rather the distance between now and some universal point in the past, a relationship. Yes, Temporal is a more friendly API, but the primary design goal is to represent time as a relational factor.

Then you can format the Date.now() number it into whatever other format you want.