Check this 3 min. video clip about the creation of the 24 time zones for the world.
Check this 8 1/2 min. video clip about the weirdest time zones in the world.
After you finish taking notes and working on your homework, if you need help, check this 4 1/2 min. video clip I created to help you find time differences between cities and countries around the world.
Here is a 12 min. video clip I created that goes in more detail my lecture notes below. This video goes through each slide.