Adding System Time and days lister
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Take a look at the javascript "Date":http://www.w3schools.com/jsref/jsref_obj_date.asp object.
As for duration of days, you'll have to save (and restore) the date on the first use of your app and then do the calculation yourself later on. There are a number of "examples":http://www.javascriptkit.com/javatutors/datedifference.shtml on the web of how to do that.