But who came up with the concept of daylight saving time and how does it work?

The concept of shifting our clocks to adjust the length of the day can be traced back toe.

Over 100 years ago, in 18 95 New Zealand entomologist George Hudson made the earliest known proposal for a time shift submitted to the Wellington Philosophical Society.

The idea was well received, but it didn't catch on.

In 1905 British builder William Will it developed a similar idea independently of Hudson.

He lobbied the British Parliament year after year, to no avail.

Until his death in 1915 the issue was revisited time and again throughout the world, but it wasn't officially put into practice nationwide until the early 20th century In Germany, the Germans, in the throes of World War we're looking for ways to conserve energy.

They decided that more daylight was the answer and became the first country to enact daylight saving time.

Today, about 70 countries around the world practice daylight saving time clocks in the northern hemisphere are usually set ahead by one hour toward the end of March or early April.

In late September early October, they're set back one hour in the Southern Hemisphere.

Reverse occurs.

While many countries originally adopted daylight saving time to extend daylight hours and cut down on the need for artificial light, critics today say it no longer saves energy.

In fact, an estimated 80% of the global population does not use daylight saving time.

Some countries are divided about its use in Australia.

Three out of eight states and territories do not practice daylight saving time in the United States.

Hawaii and most of Arizona do not bother with daylight saving time, and some states are considering doing away with it.

There are also apparent health and safety issues that come into play.

The shift to and from daylight saving time has been linked to an increased risk of heart attacks and automobile fatalities.