parse
Checks and fixes Event.duration values with incorrect format which can't be parsed by ical4j. Searches for values like "1H" and "3M" and groups them together in a standards-compliant way.
Return
duration value in RFC 2445 format ("PT3600S" when the argument was "P3600S")
Parameters
duration
value from the content provider (like "PT3600S" or "P3600S")