DST: Is it worth it?

First of all what is DST? 

DST (daylight saving time) is the practice of turning forward the clock during summer by one hour thus "increasing" the amount of daytime in a day and then back in autumn to "normal time". DST is generally practiced in only colder countries as sunny days are rarer in those countries. But, in tropical countries they do not need DST as these countries have too much sunny weather most of the year. 

George Vernon Hudson from New Zealand was the first person to invent modern DST so that he can spend more time collecting insects in his free-time after his job. So in 1895 he wrote two papers to propose the benefits of DST. Ten years later an English golfer called William Willet was dismayed that most Londoners sleep through most of the summer days. He also was saddened that he needed to stop his golfing session at dusk. So, after two years of observation, he published his solution of turning forward the clocks during summer months. However, the British parliament did not make it a law.

DST was first implemented by Germany and Austria-Hungary on 30 April 1916 to conserve coal during the ongoing First World War. The Allies soon followed suit but after the war it was abandoned except for a few countries such as the UK and Canada. During the Second World War it was also adopted. World-wide use came during the 1970s energy crisis were oil costs sky-rocketed.

Conclusion: I think DST should be used depending on the place.