The term the first 100 days dates back to President Franklin Delano Roosevelt.
“前100天”这个概念可以追溯到Franklin Delano Roosevelt总统。
英语百科
Quarter days
In British and Irish tradition, the quarter days were the four dates in each year on which servants were hired, school terms started, and rents were due. They fell on four religious festivals roughly three months apart and close to the two solstices and two equinoxes.