gistfile1.txt

var myUtil = (function() {
   function doStuffToDate(date) {}
   ...
   return { doStuffToDate: doStuffToDate, //other public funcs }
})();

myUtil.doStuffToDate(date); //use
var dstd = myUtil.doStuffToDate; //"import"

//You can also "inline" the implementations if they're short

var myUtil = (function() {
   function somePrivateFuncNotVisibleToOutSide() {...}
   ...
   return { doStuffToDate: function(date) {...}, 
            //other public funcs
   }
})();

//"dotted namespace"
var my = {}
my.util = (function() {
   function somePrivateFuncNotVisibleToOutSide() {...}
   ...
   return { doStuffToDate: function(date) {...}, 
            //other public funcs
   }
})();

// ^ Beware of defining my twice if you have my.something in many places
// You can protect against that with this ugliness:

if (typeof(my) === 'undefined') {
   var my = {}
}