Cesium seems to like JulianDate everywhere so I want to store date values as JulianDate's directly in JSON, then read/write from disk instead of converting on the fly with Cesium.JulianDate.fromIso8601() since it's very slow.
When I read in the JSON JulianDate I can't seem to assign it in a way that's recognized by Cesium functions.
Old Code (Works, but too slow)
var start = Cesium.JulianDate.fromIso8601(result1['UTC']);
New Code (Does not work)
var start = result1['JD'];