Guides
Short, practical guides to the questions behind the tools on Everywhen.
- Daylight saving time, explainedWhat daylight saving time is, why some countries use it, when clocks change and how to avoid the one-hour mistakes it causes.
- How to work out a time differenceUsing UTC offsets to calculate the time difference between two cities, including half-hour time zones, the date line and daylight saving time.
- Scheduling meetings across time zonesPractical ways to find a meeting time that works for people in several countries, and to share the burden of early and late calls fairly.
- Reading the day and night mapWhy the line between day and night changes shape through the year, what the seasons, solstices and equinoxes look like on the map, and how twilight works.