Create Exrule ranges about php-rrule HOT 1 CLOSED

Is your question about this lib in particular or about the RFC?

There is a slight difference between how the lib works and what the RFC says in regards to DTSTART.

In the RFC, there can only be one DTSTART (as in your example).

In the lib however, the DTSTART are per RRule objects so a RSet object actually contains more than one DTSTART (this causes a problem when trying to export the RSet as a RFC-compliant string by the way, and this is why the method to export a RSet as a string is not available yet).

As of today, I can't add a DTSTART in an EXRULE, so could I determine a start for the exception ?

Yes, as I explained above, using the lib only, and forgetting about the RFC compliance, you can absolutely do that. Add a new RRule object as an EXRULE with a different DTSTART.

In order to be RFC compliant, I think I need to implement the "PERIOD" syntax for RDATE and EXDATE which takes 2 dates, and does pretty much what you want. I have to read the RFC in more details to check how it works exactly, and in any case it's not an easy task though, and at the moment I'm not sure how to do it.

Do I need to add as many EXDATE as there are in the range ?

At the moment, if you want to be RFC compliant, I'm afraid that is indeed the only option.

from php-rrule.