Use moment for better postgres timestamp strings

lib/dialects/postgres/query-generator.js

@@ -3,6 +3,7 @@ var Utils       = require("../../utils")
   , DataTypes   = require("../../data-types")
   , tables      = {}
   , primaryKeys = {}
+  , moment      = require("moment")
 
 module.exports = (function() {
   var QueryGenerator = {
@@ -680,9 +681,7 @@ module.exports = (function() {
     },
 
     pgSqlDate: function (dt) {
-      var date = [ dt.getUTCFullYear(), this.padInt(dt.getUTCMonth()+1), this.padInt(dt.getUTCDate()) ].join('-')
-      var time = [ dt.getUTCHours(), this.padInt(dt.getUTCMinutes()), this.padInt(dt.getUTCSeconds())].join(':')
-      return date + ' ' + time + '.' + ((dt.getTime() % 1000) * 1000) + 'Z'
+      return moment(dt).format("YYYY-MM-DD HH:mm:ss.SSS Z")
     },
 
     pgDataTypeMapping: function (tableName, attr, dataType) {