Mapping a series of Dates to an array of Numbers

[J-Burns]

Btw dnt forget the solution should also cater to this problem:
Supposedly there is a day on which i did not do anything. Than that
particular spot in my graph should be left empty. Meaning that if i
did something on the 1st March and after it i did something on the 7th
March. Then essentially 1st march should be mapped to day1 and 7th
march to day 7(not day2)... :P