ISO 8601 parser and unparserDescription ISO 8601 provides a standard unambiguous format (several, actually) for dates and times. Unfortunately, NSDateFormatter alone does not completely support ISO 8601; in particular, it does not support week dates or ordinal dates. This came to my attention when I began writing a patch for Vienna to add support for the ttl element of RSS 2.0 and the updatePeriod, updateFrequency, and updat
