better handling of ISO 8601

[mike-sierra]

If you specify a URI/query parameter with an ISO 8601 timestamp...
example: 2016-07-01T00:00:00Z
...it gets converted to tis format when you call the example value:
"2016-07-02 00:00:00"
Only by quoting it does it stay preserved literally:
example: "2016-07-01T00:00:00Z"