Basically, I was just wondering at what time exactly the clocks go forward and back and why at this time exactly? For example when it becomes midnight, does the time go forward immediatly to 1am or…? Someone I asked yestarday said when 2am comes, we should change our clocks to 3am. Any takers? 
In the UK, it’s the last weekend in March and the last weekend in October. Supposedly the change occurs at 2am on the Sunday morning.
Remember:- “Spring, forward - Fall, back”
I can’t speak for Scotland (and I know it’s different for different countries), but in the US, the clocks go forward at 1AM on the first Sunday in April, and jump ahead one hour at that point. Note that this means that the clocks jump ahead on the East Coast of the US three hours before they jump ahead on the West Coast of the US.
I confess that I don’t remember the exact date in the fall when the US clocks fall back an hour, but it also happens at 1AM local time in the US - and yes, that means that we have two 1AM hours herein the fall. Messes up some of my system logic big-time. (“It says here that Joe worked from 8PM until 1:30AM - was that the first 1:30AM or the second one?”)
From the National Institute of Standards & Technology: “Saving Time, Saving Energy: Daylight Saving Time, Its History and Why We Use It.” For more detailed information about daylight saving time around the world, see About Daylight Saving Time.
In the U.S, the time change is effective at 2 A.M. for BOTH of the changes in the spring and the fall.
Here is a link:
http://www.boulder.nist.gov/timefreq/general/daylightsaving.html