added index.js for external usage

index.js

@@ -2,12 +2,13 @@ var dateArray = require('./lib/dateArray');
 var dateView = require('./lib/dateView');
 
 function getOHIndex(incl, excl, date, plz, cb) {
+  date = new Date(date.getFullYear(), date.getMonth(), date.getDate());
   var epochSpan = [new Date(date.getFullYear(), date.getMonth(), date.getDate() - 7),
     new Date(date.getFullYear(), date.getMonth(), date.getDate() + 2)];
   dateArray(epochSpan).getData([incl, excl], plz, function(err, result) {
     if(err) return cb(err);
     var fResult = result.filter(function(elem) {
-      return elem[0].getTime >= date.getTime();
+      return elem[0].getTime() >= date.getTime();
     });
 
     cb(null, fResult);