errors = _.range(dayDiff).map((offset) => {
const d = dayjs(0).add(offset, "day");
const fuzzyD = dayjs(toTimestamp(d.year(), d.month() + 1, d.date()));
const error = d.diff(fuzzyD, "day");
return error ? { d, date: d.format("YYYY-MM-DD"), error } : null;
})