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For a time zone and a date range of up to 1100 days, lists every offset transition and what it does to local bucketing: the hourly labels that never occur (spring-forward), the hourly labels that occur twice and would merge two real hours when grouped by local time (fall-back), and the 23-, 24.5- or 25-hour days; optionally checks up to 500 caller hourly labels (YYYY-MM-DDTHH:00) for non-existent or ambiguous ones. Built for an agent aggregating metrics, billing or schedules by local hour or day. It does not bucket your data or choose a policy (bucket by UTC instead is the safe default).