Which time is correct and whom to thank for the clock tricks you play twice a year?

Yes, we are referring to the daylight saving time (DST) or summer time, used by 70 countries in 2025. All in all, 143 countries have tried it al least once, though as you can see, many have rejected the concept. Different sources credit with the idea two Englishmen – an entomologist[=EX1] and a builder – while the whole story had started centuries before they lived, involves more people, and brings several reasons to adjust clock hands by season.