---
title: "Time zones: cheat sheet"
subtitle: "Area, volume, circles and Pythagoras"
---

# Time zones

> The words and methods from this unit, with an example of each.

:::keep-together

**time zones**: Find the difference between the UTC offsets, add or take it away, and change the day if you cross midnight. For a flight, add the flight time in the departure zone, then change zones.

$$\text{bigger offset: ahead} \qquad \text{smaller offset: behind}$$

_9:00 am Monday in Sydney, and the same moment in Perth, London and Tokyo_

:::