i'm using ActionScript SDK, and I can create a Challenge, as the date can't be parsed.
Here is my code :
var d:Date = new Date();
And here is the response :
"message":"java.text.ParseException: Unparseable date: \"2016-01-06-T09:35Z\"
What is the date format expected ? I have no control on this.
We round up to the nearest minute for challenges and they are sent in batches.
Another user in this thread had a similar issue, the solution there should help you.