Standard time zones were established in 1884 with 24 zones around the world representing one hour each. Places within the same time zone use the same time, and time changes by one hour when traveling east or west between zones. If it is 8:00 pm in Denver, Colorado (Mountain Time), the time in Atlanta, Georgia (Eastern Time) would be 9:00 pm since Atlanta is one time zone east of Denver. Traveling west across the International Date Line would result in the date changing.

1. Standard Time Zone
• In 1884,standard time were set up in 24 time zones around the
world.
• Each time zone represents one hour of the 24 hours of the day
.
• All the places within the same time zone uses the same time.
• If you travel east from one time zone to the next the time is
increased by 1 hour ,and if you travel west the time is
decreased by 1 hour.

2. World Time Zone

3. Africa Time zone

4. USA Time Zone

6. If it is 8:00 pm mountain standard time(Denver) .What time is in Atlanta
which is found in Eastern Standard time ?

7. International Date Line
What would happen if you traveled west across the “International Date Line”?