Let's get a date object containing January
21
st of next year. To do this, add
one to the current year:
let now = new Date();
let date = new Date(now.getFullYear() + 1, 0, 21);
Determine what day of the week will be
December 31
of next year.
Determine what day of the week will be one year later on the same date as today.
Determine what day of the week was a year ago on the same date as today.