It started in the late 1700s.
1997
the first day after the last day of the previous year.
the tilt of the planet
To get an answer, you have to tell us what IT is.
It started in year 1939 but i don't know the day.
Fathers day started in 1954.
D-Day was in planning for over a year.
1896
Russia
Tuesday
1917
In 1954