Now

Date.now() returns the number of milliseconds that have elapsed since midnight January 1, 1970 UTC.

When this page loaded, Date.now() was called and returned:

That number of milliseconds is:

Click the button below to call Date.now() again:

When the button was clicked, Date.now() was called and returned:

That number of milliseconds is:

The difference between the two calls to Date.now() is: