I woke up at 9am this morning, took my clock, turned it back to 8am, and re-lived the last one hour again. We always talk about how good it'll be if we can reverse the time, and it feels so surreal that I'm actually doing it now! So today, we officially have 25 hrs in a day - thanks to Daylight Saving Time (DST).
The main purpose of Daylight Saving Time (called "Summer Time" in many places in the world) is to make better use of daylight during summer (days are longer in summer). We change our clocks during the summer months to move an hour of daylight from the morning to the evening. It therefore gives us the opportunity to enjoy sunny summer evenings, for eg. doing sports before the sun sets.
At the end of summer, DST ends. That is why time is moved backwards.
"In a typical case where a one-hour shift occurs at 02:00 local time, in spring the clock jumps forward from 02:00 standard time to 03:00 DST and the day has 23 hours, whereas in autumn the clock jumps backward from 02:00 DST to 01:00 standard time, repeating that hour, and the day has 25 hours.
A digital display of local time does not read 02:00 exactly, but instead jumps from 01:59:59.9 either forward to 03:00:00.0 or backward to 01:00:00.0." (Wikipedia)
Interesting and confusing concept.
If you're interested and confused, visit this website: http://www.webexhibits.org/daylightsaving/index.html
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