Events created during daylight savings changeover hour cause iCal serialization to fail

[reidab]

When trying to set the created time on the iCal event, things go south with FATAL -- : TZInfo::AmbiguousTime

From the TZInfo docs:

AmbiguousTime is raised to indicates that a specified time in a local timezone has more than one possible equivalent UTC time. This happens when transitioning from daylight savings time to standard time where the clocks are rolled back.

This was the cause of #532 and is still an issue

[dhedlund]

The following commit in the ActivateHub project might provide a decent workaround. When I patched that project, I wasn't able to find a better solution without having to monkey-patch the ri_cal gem, which has been unmaintained for a very long time:

activate/ActivateHub@f183474#diff-bfad13752942f6ec74d1f0a84ead0320