Jun Pataleta 8ddc656739 MDL-57658 calendar: Fix rrulemanager and unit tests
Issues fixed:
* Additional rule validations.
* Rewrote recurrence logic.
* Additional unit tests, especially from the examples in the RFC.
* The date format "YmdThis" results into an incorrect date for the
  "UNTIL" parameter. The literal "T" should be escaped, and a literal
  "Z" is also needed at the end of the format string to indicate UTC.
* Implemented handling of negative modifier values for BYxxx rules.
* Implemented handling of BYWEEKNO, BYYEARDAY, BYSETPOS, BYHOUR,
  BYMINUTE, BYSECOND rules.
2017-03-09 16:10:08 +08:00
..
2016-09-25 15:06:54 -04:00