Time zone guides
Ten reference guides covering the parts that actually cause trouble: seasonal clock changes, ambiguous abbreviations, the date line and the software bugs that follow from all three.
Daylight saving explained
Which countries change their clocks, when they do it, and why the same two cities can be five hours apart one week and six the next.
UTC, GMT and Zulu time
What UTC actually is, how it differs from GMT, why aviation says Zulu, and when the distinction matters.
Scheduling across time zones
A practical method for booking meetings across zones: finding the overlap, rotating the pain, and stopping recurring calls from drifting.
Why abbreviations are ambiguous
IST means three different things, CST means three more. Which abbreviations are ambiguous and what to use instead.
The International Date Line
Why crossing one line changes the date, how a flight can arrive before it left, and which places are furthest apart in time.
Remote work across zones
How distributed teams actually handle time differences: core hours, async defaults, handovers and the failure modes to avoid.
Jet lag and travel planning
Why eastward flights hurt more, how long adjustment actually takes, and how to plan arrivals around the time difference.
Market trading hours
When the major exchanges open in your local time, where the sessions overlap, and why daylight saving moves the open twice a year.
Timestamps for developers
How to store, transmit and display time in software without creating bugs: UTC storage, IANA zones and ISO 8601.
Half-hour time zones
India at UTC+5:30, Nepal at UTC+5:45, Chatham at UTC+12:45 — which places use fractional offsets and why.
US time zones explained
The six US time zones, which states split between two, where daylight saving does not apply, and how the gaps shift twice a year.
European time zones
WET, CET and EET, why Spain is an hour off the sun, and how EU clock changes differ from the American dates.
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How these guides are written
Each one starts from a real scheduling failure, uses the IANA database and primary legislation for its figures, and is reviewed before publication.
Question first
Each guide starts from a real search — the thing people actually need to settle.
Official figures
Definitions come from standards bodies, not from other websites.
Worked examples
Numbers are shown in context so you can check the maths yourself.
Reviewed twice
Every figure is verified by a second person before publication.
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