I used someone else’s code and finally figured it out.
<%* let ISO_8601_SHORT_FMT = “YYYY-MM-DD”;
let today = moment();
let yesterday = moment(today).subtract(1, ‘d’);
let tomorrow = moment(today).add(1, ‘d’);
let this_week = moment(today).startOf(‘isoWeek’);
let this_week_num = today.isoWeek();
let last_week = moment(today).subtract(1, ‘w’).startOf(‘isoWeek’);
let last_week_num = last_week.isoWeek();
let next_week = moment(today).add(1, ‘w’).startOf(‘isoWeek’);
let next_week_num = next_week.isoWeek();
let week_delta = Math.abs(next_week_num-this_week_num); %>