Method _getFirstDay

packages/main/src/DayPicker.ts:935–955

()

	}

	_getFirstDay(): CalendarDate {
		let daysFromPreviousMonth;

		const firstDayOfWeek = this._getFirstDayOfWeek();

		// determine weekday of first day in month
		const firstDay = new CalendarDate(this._calendarDate, this._primaryCalendarType);
		firstDay.setDate(1);

		daysFromPreviousMonth = firstDay.getDay() - firstDayOfWeek;

		if (daysFromPreviousMonth < 0) {
			daysFromPreviousMonth = 7 + daysFromPreviousMonth;
		}

		if (daysFromPreviousMonth > 0) {
			firstDay.setDate(1 - daysFromPreviousMonth);
		}

		return firstDay;
	}

	_getFirstDayOfWeek(): number {
		const localeData = getCachedLocaleDataInstance(getLocale());