Add functionality to return UTC date when UTC date is passed to startOfMonth #12
Description
As of now if we pass UTC date 2023-08-01T07:00:00.000Z to startOfMonth is returning 2023-07-01T05:00:00.000Z
https://github.com/checkdigit/time/blob/main/src/date-fns/startOfMonth/index.ts