Date is the standard class for representing points in time. You can create a date object with new and it defaults to the current date and time:
console.log(new Date());

You can also create objects for specific points in time:

console.log(new Date(2009, 11, 9))
// 2009-12-08T11:00:00.000Z

Note how the above output looks "wrong". That's because js uses a really dumb convension where month numbers start at 0 (December is thus 11), yet day numbers start at one.

unix

You can print the unix timestamp (in milliseconds) with .getTime() and you can also create a date from a timestamp by creating a Date() with a the timestamp as the first and only argument.

methods

getFullYear
getMonth
getDate
getHours
getMinutes
getSeconds

parsing

Typically, parsing dates is done with regex:

function getDate(string) {
	// underscore skips the full match returned in the array by exec
	let [_, month, day, year] =
		/(\d{1,2})-(\d{1,2})-(\d{4})/.exec(string);
	return new Date(year, month - 1, day);
}
console.log(getDate("1-30-2003"))
// 2003-01-29T11:00:00.000Z