Function utcWeekday

external/.d3.js:15850–15859

(i)

const timeSaturdays = timeSaturday.range;

function utcWeekday(i) {
  return timeInterval((date) => {
    date.setUTCDate(date.getUTCDate() - (date.getUTCDay() + 7 - i) % 7);
    date.setUTCHours(0, 0, 0, 0);
  }, (date, step) => {
    date.setUTCDate(date.getUTCDate() + step * 7);
  }, (start, end) => {
    return (end - start) / durationWeek;
  });
}

const utcSunday = utcWeekday(0);
const utcMonday = utcWeekday(1);