Support ISO8601 dates by specifying “ISO8601” value for the “dateFormat”...

Support ISO8601 dates by specifying “ISO8601” value for the “dateFormat” User Info key. (https://www.evernote.com/shard/s3/sh/2146a5e0-2440-45ab-9dc8-5f3800d7d1b8/a6fa0ff24d77ca1794a0a842b9f71aab)
Depends on ISO8601DateFormatter pod.