Why would you invoke new Date without parentheses? [duplicate]

Answer 1

There is no difference in both statements, parenthesis are optional, So usually programmers drop it.

In your second example:

new Date().getTime();

one of good practice programmers follow to wrap object in parenthesis before calling function or property. so it will be:

(new Date()).getTime();

as discussed above object parenthesis are optional. So shorter cleaner code is:

(new Date).getTime();