What is the international date line? describe its geographic location. why doesn't it follow a straight line? why do we need it?

It is a superficial imaginary line drawn on the Pacific Ocean and very close to the meridian. It was devised by Sir Sandford Fleming in 1879 in order to maintain a uniform time system.

So, according to the location to this meridian, the date is changed in a day, as follows:

- When we go from the Western Hemisphere to the Easter Hemisphere in the meridian, we have to add one day.

-When we pass in the opposite direction, we have to delay one day.

The International Date Line is located in the Pacific Ocean. This area and this  meridian was chosen because it is a region with almost depopulated areas (very few inhabitants), so it does not make it difficult to maintain any local time.

However, a part of this meridian passes through the Bering Strait between Alaska and Siberia, causing both sides of the Strait to have different dates.

Although the international date line originates at the North Pole and extends the length of the meridian, it deviates from this initial length  many times.

This is due to geopolitical reasons, in order to maintain a normal standard for changing dates in aviation and maritime trips at the time of crossing the line.

Although countries are not oblied to use the international date line as the standard on configuration dates, their purpose is mainly to avoid overlapping dates.

In addition, this line is necessary to ensure that the actual calendar and dates are coordinated and in order to have an understandable synchronization in world time.