Rename weekEndDate to beginningOfTime

[aahna-ashina]

          This had me scratching my head, because I am simple. Can we have a const like "the beginning of contribution time" defined somewhere and use that here instead, and how is it letting you change the time on the const date, the world is broken.

const theBeginningOfTime = new Date('2022-06-05T00:00:00Z')
let currentEndDate = theBeginningOfTime;

Go....

Originally posted by @johnmark13 in #23 (comment)