moment check valid date

var date = moment("2016-10-19");
var check = date.isValid();
console.log(check);function check() {
  var now = moment();
  var hourToCheck = (now.day() !== 0)?17:15;
  var dateToCheck = now.hour(hourToCheck).minute(30);
  
  return moment().isAfter(dateToCheck);
}

console.log(check())