How to Read a tzdb Zone and Rule Line: A Developer's Guide
A step-by-step breakdown of tzdb syntax: Zone definitions, Rule transitions, Link aliases, and AT/UNTIL modifiers.
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The Fractional Offsets Still in Use Today: 15, 30, and 45 Minutes
Why several billion people do not observe whole-hour UTC offsets, from India and Iran to Nepal and Chatham Island.
Read ArticleWatching Standard Time Spread Across the Globe: 1883 to Today
How local solar time gave way to coordinated standard time zones, driven by railroads, telegraph lines, and international diplomacy.
Read ArticleWhat the tz database is and why one text file runs the world's clocks
How a public domain collection of plain text files maintained by volunteers coordinates timestamps for billions of devices.
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