unicorn/prefer-date-now

new Date().getTime() creates a Date object only to read one number from it. Date.now() returns the same number without the object.

Turning a new Date() into a number is reported too, as in +new Date(), Number(new Date()), or arithmetic such as new Date() - start.

--fix rewrites everything except the arithmetic.

Configure

Off by default. To turn it on:

[lint.rules]
"unicorn/prefer-date-now" = "error" # or "warn"

Examples

Reported:

const start = new Date().getTime();
const stamp = +new Date();
const elapsed = new Date() - start;

Not reported:

const start = Date.now();
const stamp = Date.now();
const elapsed = Date.now() - start;

const created = new Date(user.createdAt).getTime();