Reading a Time Zone Map

Defining the Skill
A time zone map shows the 24 time zones of the world. The prime meridian runs through Greenwich (GREHN•ich), England. Each zone east of Greenwich is one hour later than the zone before. Each zone west of Greenwich is one hour earlier. The International Date Line runs through the Pacific Ocean. It is the location where each day begins. If it is Saturday to the east of the International Date Line, then it is Sunday to the west of it. 

Applying the Skill
Use the strategies listed below to help you find times and time
differences on a time zone map.

How to Read a Time Zone Map
Strategy 1: Read the title. It tells you what the map is intended to show.
Strategy 2: Read the labels at the top of the map. They show the hours across the world when it is noon in Greenwich. The labels at the bottom show the number of hours earlier or later than the time in Greenwich.
Strategy 3: Locate a place whose time  you know. Locate the place where you want to know the time. Count the number of time zones between them. Then add or subtract that number of hours.
For example, if it is noon time on the west coast of Africa, you can see that it is 7:00 A.M. on the east coast of the United States. That is a difference of five hours.

Reference: http://petrimoulx.pbworks.com/f/Chapter1skillbuilder.pdf