TimezoneCast Guides
A reference library for working across time zones. These guides cover practical time zone conversion, daylight saving time, world clocks, and meeting planning — the same problems the TimezoneCast tools solve, written down so you can read, link, and share.
Guides are evergreen. They are not news posts and they don't track DST policy changes in real time. Where a topic depends on the current date (for example, today's offset between two cities), the live tools are the source of truth.
What's covered
- ·Time zone conversion: how offsets work, when they change, and how to read abbreviations like EST, PST, GMT, and IST.
- ·Daylight saving time: when transitions happen in the US, EU, UK, and other regions, and what that means for recurring meetings.
- ·World clocks: how to compare current time across cities and continents at a glance.
- ·Meeting planning: how to find a fair overlap window between teams in different parts of the world.
Guides
Best Time to Meet Between New York and London
Working-hour overlap windows for the most common transatlantic pair, including DST shifts twice a year.
How Daylight Saving Time Affects Remote Teams
When DST starts and ends in the US, EU, and UK, why the dates differ, and how to keep recurring meetings predictable.
Time Zone Abbreviations Explained: EST, PST, GMT, IST and More
What EST, EDT, PST, PDT, CST, IST, GMT, and UTC actually mean, and where the abbreviations are ambiguous.
How to Schedule Meetings Across Three Time Zones
A practical workflow for finding a fair meeting window when a team spans the Americas, Europe, and Asia.
Use the tools while you read
Time Zone Converter
Convert between any two zones with DST-accurate offsets. Browse all conversion pairs.
World Clock
Current local time in 27 major cities, grouped by region.
Meeting Planner
Find working-hour overlap windows for popular city pairs.
Time Zone Abbreviations
Reference guide for 50+ abbreviations: what they mean and where they apply.
Popular conversion pages
The conversion pages give you a live working-hour overlap and a meeting planner in one view.
How these guides are written
Guides aim to give a direct, useful answer up front and then explain the reasoning. Time zone math comes from the IANA time zone database via Luxon — the same source the TimezoneCast tools use. See the methodology page for details on how DST, offsets, and overlap windows are computed.