How can I convert a date into an integer?

Question

I have an array of dates and have been using the map function to iterate through it, but I can't figure out the JavaScript code for converting them into integers.

This is the array of dates:

var dates_as_int = [     "2016-07-19T20:23:01.804Z",     "2016-07-20T15:43:54.776Z",     "2016-07-22T14:53:38.634Z",     "2016-07-25T14:39:34.527Z" ]; 

Answer 1

var dates = dates_as_int.map(function(dateStr) {     return new Date(dateStr).getTime(); }); 

=>

[1468959781804, 1469029434776, 1469199218634, 1469457574527] 

---

Update: ES6 version:

const dates = dates_as_int.map(date => new Date(date).getTime()) 

Answer 2

Using the builtin Date.parse function which accepts input in ISO8601 format and directly returns the desired integer return value:

var dates_as_int = dates.map(Date.parse);