tzdb (Time Zone Database)
IANA time zone database, tracks global time zones
Episodes
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#2620: How Atomic Clocks Actually Keep TimeWhy the second is defined by a cesium atom, not the Earth's rotation — and why leap seconds are causing chaos. -
#2450: The Time Zone King and the Database That Runs the WorldHow a missed train led to global time zones, why DST exists for bug hunting, and the volunteer database that keeps the internet on time.