I\'m trying to get a spreadsheet with simple formatted dates when a form is submitted, but all dates, including the timestamp keep getting posted as \"Dec 31 1969 2:00PM\"..
I suggest review this:
https://developers.google.com/apps-script/reference/utilities/utilities?hl=es#formatDate(Date,String,String)
And the format patterns are these:
http://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html
And one example to help you
Utilities.formatDate(thisFile.getLastUpdated(),"GMT-5", "yyyy/MM/dd, HH:mm:ss")