Date object

Question

Please explain this topic and syntax of date object.
How does 86400000 represent Fri Jan 02 1970 00:00:00?
Link to my code:
https://code.sololearn.com/WVUqLvSZpQg2/?ref=app
Thanks in advance

Answer 1

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date

Answer 2

I see that you have updated your question to be specific, so I am posting a second answer.
the number of milliseconds elapsed since January 1, 1970 00:00:00 UTC
can be got with Date.now().
https://code.sololearn.com/WY59c9VobaoJ/?ref=app
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/now
If you pass a long number into Date constructor, it is treated as the number of milliseconds elapsed since January 1, 1970 00:00:00 UTC.

Answer 3

Thank you so much