dateDateDeltaInDays.js

// Password change timestamp
var int_pass_rotation = "2017-03-06";

var lastPasswordUpdateDate = new Date(int_pass_rotation);
console.log(lastPasswordUpdateDate);

// GET CURRENT DATE
var now = new Date();
console.log(now);

// Compare timestamp 
var dateDelta = (now - lastPasswordUpdateDate) / (1000*60*60*24);

console.log(dateDelta);

if (dateDelta < 90) {
   console.log("no need to change password");
} else {
    console.log("password needs to be changed");
}