From https://datatracker.ietf.org/doc/html/rfc5545#section-3.3.5
If, based on the definition of the referenced time zone, the local
time described occurs more than once (when changing from daylight
to standard time), the DATE-TIME value refers to the first
occurrence of the referenced time. Thus, TZID=America/
New_York:20071104T013000 indicates November 4, 2007 at 1:30 A.M.
EDT (UTC-04:00).
Since date-time values in RFC 5545 don't accept offsets, how do I specify a timestamp in that second hour, rather than the first?