Time Zone, DST & Holiday Guides

Solar noon and clock noon rarely match. Learn how time zones, Daylight Saving Time, and the equation of time push real midday off 12:00 - sometimes by hours.

A leap second is a one-second adjustment to UTC that keeps atomic time aligned with Earth's rotation. Here's how it works and why it's being abolished by 2035.

Trace the history of timekeeping from Egyptian obelisks and water clocks to the pendulum, the marine chronometer, quartz, and today's atomic and optical lattice clocks.

A plain-English guide to the IANA time zone database (tzdata, zoneinfo, the Olson database): what it is, its history, its city-based naming, and why the whole software world depends on it.

What a Unix timestamp is, how to read and convert one, and why signed 32-bit time overflows on 19 January 2038 — plus the 64-bit fix.

Learn the Pomodoro Technique plus five proven time-management methods, with simple how-to steps you can start using today with nothing but a timer.

Cross-timezone meetings go wrong from bare clock times, shifting DST gaps, and thin overlaps. Learn the habits, overlap math, and async tactics that fix it.

GMT and UTC show the same clock time but are different kinds of thing: GMT is a time zone, UTC is the atomic standard every zone is measured against.

What Daylight Saving Time is, where it came from, how spring forward and fall back works, who observes it, and the debate over abolishing it.

A light-year measures distance, not time. Discover how the constant speed of light turns a year into 9.46 trillion km, and why looking at stars means looking into the past.

What time zones really are, how UTC offsets work, the history behind them, and why software relies on the IANA database instead of raw offsets.