thetimezone Open world clock

thetimezone guides & articles

12 in-depth guides on The Time Zone and related topics.

Daylight saving time

Daylight saving time Why Time Differences Shift in March and October Time differences shift in March and October because countries start and end daylight saving on different dates, changing the gap between cities. 5 min read Daylight saving time What Is Daylight Saving Time? A Full Explainer A full explainer on daylight saving time, covering why clocks change, when spring forward and fall back happen, who skips it, and how it shifts UTC offsets. 6 min read

Scheduling across zones

Scheduling across zones Time Difference Between London and New York, Month by Month The time difference between London and New York changes twice a year due to different daylight saving start and end dates. 3 min read Scheduling across zones Best Times to Call Between the US and Asia The best times to call between the US and Asia despite a near-opposite clock, with overlap windows for each US zone, the date-change catch, and simple rules. 6 min read Scheduling across zones Best Times to Call Between the US and Europe The best times to call between the US and Europe, with overlap hours for each US zone, the daylight saving gap trap, and simple rules for booking transatlantic calls. 6 min read Scheduling across zones How to Schedule a Meeting Across Time Zones A practical guide to scheduling meetings across time zones, covering how to find overlap hours, handle daylight saving, anchor to UTC, and dodge classic mistakes. 5 min read

World time & travel

World time & travel Current Time in Europe Explained: Zones & Rules The current time in Europe explained, covering the three main zones, which countries sit where, how summer time works, and the odd exceptions that catch travelers. 6 min read World time & travel The International Date Line Explained Simply The International Date Line explained simply, covering where it runs, why it zigzags, how crossing it adds or subtracts a day, and how tomorrow can exist today. 6 min read

Time zones explained

Time zones explained How Time Zones Work: A Clear, Complete Guide A clear, complete guide to how time zones work, covering the 15-degrees-per-hour rule, UTC offsets, the odd half-hour zones, and how to compare times worldwide. 6 min read Time zones explained How to Convert Time Zones Without Getting It Wrong How to convert time zones correctly, covering the offset method step by step, handling daylight saving and the date change, and the mistakes that cause errors. 6 min read

UTC & GMT

UTC & GMT UTC vs GMT: What's the Difference, Really? UTC vs GMT explained in plain language, covering why they usually match, how atomic clocks and leap seconds separate them, and which term to use when. 6 min read UTC & GMT Why Servers Use UTC (and Why You Should Too) Why servers use UTC: how a single daylight-saving-free time standard keeps logs, databases, and distributed systems consistent, and why aviation relies on it too. 6 min read