I am looking for a PHP class that can parse an ICalendar (ICS) file and correctly handle timezones.

I already created an ICS parser myself but it can only handle timezones known to PHP (like 'Europe/Paris').

Unfortunately, ICS file generated by Evolution (default calendar software of Ubuntu) does not use default timezone IDs. It exports events with its a specific timezone ID exporting also the full definition of the timezone: daylight saving dates, recurrence rule and all the hard stuff to understand about timezones.

This is too much for me. Since it was only a small utility for my girlfriend, I won't have time to investigate further the ICalendar specification and create a full blown ICalendar parser myself.

So is there any known implementation in PHP of ICalendar file format that can parse timezones definitions?