Function buildMonthDays

src/index.ts:847–912

(year: number, month: number)

  }

  function buildMonthDays(year: number, month: number) {
    const firstOfMonth =
      (new Date(year, month, 1).getDay() - self.l10n.firstDayOfWeek + 7) % 7;

    const prevMonthDays = self.utils.getDaysInMonth(
      (month - 1 + 12) % 12,
      year
    );

    const daysInMonth = self.utils.getDaysInMonth(month, year),
      days = window.document.createDocumentFragment(),
      isMultiMonth = self.config.showMonths > 1,
      prevMonthDayClass = isMultiMonth ? "prevMonthDay hidden" : "prevMonthDay",
      nextMonthDayClass = isMultiMonth ? "nextMonthDay hidden" : "nextMonthDay";

    let dayNumber = prevMonthDays + 1 - firstOfMonth,
      dayIndex = 0;

    // prepend days from the ending of previous month
    for (; dayNumber <= prevMonthDays; dayNumber++, dayIndex++) {
      days.appendChild(
        createDay(
          `flatpickr-day ${prevMonthDayClass}`,
          new Date(year, month - 1, dayNumber),
          dayNumber,
          dayIndex
        )
      );
    }

    // Start at 1 since there is no 0th day
    for (dayNumber = 1; dayNumber <= daysInMonth; dayNumber++, dayIndex++) {
      days.appendChild(
        createDay(
          "flatpickr-day",
          new Date(year, month, dayNumber),
          dayNumber,
          dayIndex
        )
      );
    }

    // append days from the next month
    for (
      let dayNum = daysInMonth + 1;
      dayNum <= 42 - firstOfMonth &&
      (self.config.showMonths === 1 || dayIndex % 7 !== 0);
      dayNum++, dayIndex++
    ) {
      days.appendChild(
        createDay(
          `flatpickr-day ${nextMonthDayClass}`,
          new Date(year, month + 1, dayNum % daysInMonth),
          dayNum,
          dayIndex
        )
      );
    }