Sunday at 2am the U.S. moved their clocks back. Any parent knows that their kids don't move their clock backs simply because it is a rule.

I wondered where it came from, why do we have daylight saving time (DST) and does everyone observe it?

Wikipedia, of course, has good information on all of this.

It has always been around on some level. Many workers and people adjusted their days based on the hours of sunlight on a specific day. In fact, many of Jewish laws revolve around how many hours of daylight there is in a day.

But it wasn't until 1895 when George Vernon Hudson came up with modern day DST. He submitted a paper a few years later and countries began adopting it. The United States adopted it in 1918. Of course, there were changes made to it over the years.

But it was not adopted everywhere. He is a map from Wikipedia showing where it was, wasn't adopted.

DaylightSaving-World-Subdivisions

   DST used
   DST no longer used
   DST never used

Interesting stuff...