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Zulu time is just UTC with a different name. Here's why pilots, the military, and meteorologists use it instead of saying "UTC."

EST, PST, IST, JST — common abbreviations for time zones. Some are unambiguous; some aren't. Here's the full guide and what to use instead.

A UTC offset like "+5:30" or "-3" tells you how many hours a zone is ahead of or behind UTC. Here's how to read it and what to do with it.

Before 1884 every town had its own time. Here's how the world arrived at a single universal clock — through railroads, conferences, and atomic physics.

A leap second is a one-second adjustment added to UTC to keep it aligned with Earth's rotation. Here's how they work and why they're being abolished.

A complete list of every UTC offset used in the world today, with example cities, abbreviations, and DST notes for each.

India is UTC+5:30 — half an hour off from anyone you'd expect. Here's the political and geographic story behind that choice.

Why is it tomorrow in Tokyo while it's still today in New York? Here's how time zones actually work, from Earth's rotation to fractional offsets.

The IANA tz database is the open-source ledger of every time zone rule on Earth. It powers your phone, your servers, and almost every app that handles dates.

How long since the moon landing? Y2K? The iPhone launch? Time flies in surprising ways. Here's a retrospective.