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Before I can say for sure, I really need to see your code. But make sure that what you are sending via REST is not the toString() output of the date but the toJSON() output. myDate.toJSON(); //"2014-03-07T14:48:56.431Z"
Maybe you can ask Server administrators to export all site/subsite permissions to a file for you via PowerShell. Hope this link can help you. http://johanmeyer.ukuvuma.co.za/2013/02/22/export-all-user-permissions-from-a-sharepoint-2010-site-to-csv/
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