Handle stuff like DTSTART;TZID=America/New_York:20101119T231307
Handle stuff like DTSTART;TZID=America/New_York:20101119T231307

Thanks to Matthias Althaus for pointing out that while the class
attempts to handle this kind of thing, it doesn't actually work.

lkraav/davical-rss-feature-branch,lkraav/davical-rss-feature-branch,lkraav/davical-rss-feature-branch,lkraav/davical-rss-feature-branch