I\'ve seen so many different standards for the JSON date format:
\"\\\"\\\\/Date(1335205592410)\\\\/\\\"\" .NET JavaScriptSerializer \"\\\"\\\\/Date(
When in doubt simply go to the javascript web console of a modern browser by pressing F12 (Ctrl+Shift+K in Firefox) and write the following:
F12
Ctrl+Shift+K
new Date().toISOString()
Will output:
"2019-07-04T13:33:03.969Z"
Ta-da!!