tzdata: Back to the Future!
summary
A single line in tzdata ties modern clocks to a historical legal change and every system that schedules or logs depends on it being right. The dataset contains ~2,200 rules that encode offsets like the November 18 1883 line where cities dropped LMT after the transcontinental railroad forced standard time. The database includes per‑city LMT offsets, textual provenance in comments, and the four time zone partitioning that actually resolves railway and legal confusion.
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