Only getting dem Github notification emails on weekdays

whitelist_github.js

function whitelistGithub() {
  if (isWeekend() || isEvening()) { return; }
  
  var label = GmailApp.getUserLabelByName("github");
  var threads = label.getThreads();
  for (var i = 0; i < threads.length; i++) {
    if (threads[i].isUnread()) {
      threads[i].moveToInbox();
    }
  }
}
 
function isWeekend() {
  return (
    isSaturdayOrSunday() ||
    isFridayEvening() ||
    isMondayMorning()
  );
}

function isEvening() {
  var hour = (new Date()).getHours();
  return (hour < 7 || hour > 18);
}

function isSaturdayOrSunday() {
  var day = (new Date()).getDay();
  return (day === 0 || day === 6);
}

function isFridayEvening() {
  var d = new Date();
  var day = d.getDay();
  var hour = d.getHours();
  return (day == 5 && hour > 18);
}

function isMondayMorning() {
  var d = new Date();
  var day = d.getDay();
  var hour = d.getHours();
  return (day == 1 && hour < 8);
}