who changed the time of day the days officially began? (from "sun-up" to "midnight") And what year was that?

Question

No i think it was a catholic "high priest" way back when. Nothing to do with d.s.t.
Like I said; used to be that offically, the day began at sun-up - not midnight.

Answer 1

I'm not sure but probably with the Romans. After all, they created the first mainly and widely sued calender - the Julian calender - after Julius Caeser in which it began in March and ended in Febuary. But back then some of the months had different names.

Even before the romans, long before Christ and so on, people began to work at daybreak because they couldn't seen in the dark. But who actually coined the terms, I have no idea.

Answer 2

Do you mean daylight savings time?
that was after or during WWI around 1918 I think?
go to www.history.com and type what you need to know in the search bar