Overview
DST changes and half-hour offsets trip people up. Verify conversions before booking international calls.
Convert both the hour and the date. Daylight saving does not switch on the same weekend in every country.
How to use it
- Open World Clock.
- Add your home city first, then the offices or destinations you actually call.
- Keep Time Zone Converter or Meeting Planner for a second phase.
Good to know
Daylight saving does not change on the same weekend everywhere. Re-check the pair of cities in the week of a clock change.
The tools are free on the TimerClock home page. Settings stay in this browser. The privacy policy explains what is stored.
Frequently asked questions
What is this guide for?
DST changes and half-hour offsets trip people up. Verify conversions before booking international calls.
Which TimerClock page should I open?
Start with World Clock. Use Time Zone Converter when you want a closer variation.
Does the world clock follow my laptop time?
City offsets are calculated from your device clock. If that clock is wrong, every city on the page is wrong by the same amount.
How do I avoid a middle-of-the-night meeting?
Look at both the hour and the date for each city before you send the invite.
When was this guide updated?
October 2, 2026. The steps match the tools linked on this page.