How Daylight Saving Time Works
Why clocks change twice a year, which countries still do it, and how to handle the transitions without confusion.
7 min readGuides
Plain-English explanations of time zones, daylight saving time, UTC, and everything in between.
Time zones are more complicated than they look. Clocks spring forward and fall back on different dates in different countries. Some regions skip daylight saving entirely. UTC and GMT sound interchangeable but aren't quite. Half-hour and 45-minute offsets exist. And the same city can be in two different time zones depending on the time of year.
These guides cut through the confusion — from the basics of what a time zone actually is, to practical guides for developers, travellers, and remote teams scheduling across continents.
UTC and GMT Explained
The difference between UTC and GMT, why it matters for software and travel, and how UTC offsets work.
6 min readHow to Schedule Meetings Across Time Zones
A practical guide to finding overlap windows, avoiding DST traps, and communicating times unambiguously.
8 min readWhat Is a Time Zone?
A complete explanation of how time zones are defined, why they follow political borders, and how the IANA database works.
7 min readWhy Countries Have Different Time Zones
The history behind how the world carved itself into time zones — from railroads to the International Meridian Conference.
8 min readThe History of Standard Time
How humanity went from local sun time to a globally agreed system, and the political battles fought along the way.
9 min readTime Zones for Developers
The most common time zone mistakes in software — storing UTC, handling DST gaps, and displaying local time correctly.
10 min readDaylight Saving Time Around the World
Which regions observe DST, which abolished it, and why the switch dates differ between countries.
6 min readWhen Do Clocks Change in 2026?
Exact dates when clocks change for Daylight Saving Time in 2026 for the US, UK, EU, Australia, New Zealand, and every other country that observes DST.
6 min readCountries That Are Already in Tomorrow
Which countries are so far ahead of UTC that they are already in the next calendar day — and what that means for international scheduling.
5 min readHow to Read a 24-Hour Clock
A plain-English guide to military time and the 24-hour format — how to convert it, when it is used, and why it avoids AM/PM confusion.
4 min readTime Zone Differences Between US Cities
A practical reference for the time gaps between every major US city — New York, Chicago, Denver, Los Angeles, Phoenix, Honolulu, and Anchorage.
5 min readWhy China Only Has One Time Zone
China spans five natural time zones but uses a single one. Here is the political history behind that decision and what it means for daily life.
6 min read