Daylight saving time (DST) moves clocks forward in spring and back in autumn in many countries. Nigeria, Ghana, Kenya, India, China and Japan do not use DST, but much of Europe and North America does.
The “shoulder weeks”
The United States and Canada change clocks on the second Sunday of March and the first Sunday of November. The United Kingdom and the European Union change on the last Sunday of March and the last Sunday of October. For a few weeks each year the difference between, say, London and New York is four hours instead of five.
For someone in Abuja, a meeting with London at 09:00 London time is at 09:00 Abuja time in summer but 10:00 Abuja time in winter — even though nothing changed in Nigeria.
Skipped and repeated hours
When clocks go forward, one local hour does not exist (in New York 02:00–02:59 is skipped). When they go back, an hour happens twice. WhatxTime’s converter tells you when a time you entered falls in one of these hours and how it was resolved.
Practical tips
- Schedule recurring meetings in one named city’s time and let calendars convert it.
- Check the meeting planner for the actual date, not just today.
- Look at a city’s DST section to see its next clock change.