Fixed timestamp not properly set when adding tasks from presets

presets.coffee

@@ -2,7 +2,6 @@ config = require './config'
 common = require './common'
 db = require './db'
 mongoQuery = require './mongo-query'
-mongodb = require 'mongodb'
 query = require './query'
 
 
@@ -90,9 +89,9 @@ exports.assertPresets = (deviceId, presetsHash, callback) ->
             throw new Error('Unknown configuration type')
 
       if getParameterValues.length
-        taskList.push {device : deviceId, name : 'getParameterValues', parameterNames: getParameterValues, timestamp : mongodb.Timestamp()}
+        taskList.push {device : deviceId, name : 'getParameterValues', parameterNames: getParameterValues, timestamp : new Date()}
       if setParameterValues.length
-        taskList.push {device : deviceId, name : 'setParameterValues', parameterValues: setParameterValues, timestamp : mongodb.Timestamp()}
+        taskList.push {device : deviceId, name : 'setParameterValues', parameterValues: setParameterValues, timestamp : new Date()}
 
       if not presetsHash
         presetsHash = calculatePresetsHash(presets)