class TZInfo::TimezonePeriod

{TimezonePeriod} represents a period of time for a time zone where the same offset from UTC applies. It provides access to the observed offset, time zone abbreviation, start time and end time.

The period of time can be unbounded at the start, end, or both the start and end.

@abstract Time zone period data will returned as an instance of one of the

subclasses of {TimezonePeriod}.