SELECT FullUrl AS 'Site URL', TimeCreated,DATEADD(d,DayLastAccessed + 65536, CONVERT(datetime, '1/1/1899', 101)) AS lastAccessDate FROM Webs WHERE (DayLastAccessed <> 0) AND (FullUrl LIKE N'sites/%') ORDER BY lastAccessDate

var listTitle = 'Announcements';

  var context = new SP.ClientContext.get_current();
  var web = context.get_web();
  var list = web.get_lists().getByTitle(listTitle);
  context.load(list);
  context.executeQueryAsync(
     function() {
        console.log(list.get_lastItemModifiedDate());
     },
     function(sender,args){
        console.log(args.get_message());
     }
  );