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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.