The large, colorful World Zone Map Paper Craft shows all 24 zones side by side as vertical bands. If we assign a certain hour of the day to each field between reddish-brown dividing lines, there will be room for every 24 hours of the day between the blue line on the left and the blue line on the right.
Therefore, whoever crosses them from west to east may place the same date for two consecutive days. On the other hand, if you pass the dateline from east to west, you have to skip a full day in the calendar.
World Zone Map Paper Craft is great for your kids to get into the geography.