clocks go back

When I was in my country, we used to have Summer time system. I thought this is the ridiculous idea as I had to change my bio-rythm and we never take the advantage of daylight.
Apperently we do not have this much of different daylights between summer and winter.
It is just something to show the public by governments.
However, in London, it is absolutely necessary. Nowadays it is getting dark from 4 or 5pm.
I would like to cut the middle of the long winter night, when I met my dear I would spend it.

On the other hand time is just promises among people, like ages.
We promise to set back a hour and get a hour extra sleep.