react-dates/lib/utils/getCalendarMonthWeeks.js

A responsive and accessible date range picker component built with React

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports['default'] = getCalendarMonthWeeks;
function getCalendarMonthWeeks(month, enableOutsideDays) {
  // set utc offset to get correct dates in future (when timezone changes)
  var baseDate = month.clone();
  var firstOfMonth = baseDate.clone().startOf('month').hour(12);
  var lastOfMonth = baseDate.clone().endOf('month').hour(12);

  var currentDay = firstOfMonth.clone();
  var currentWeek = [];
  var weeksInMonth = [];

  // days belonging to the previous month
  for (var i = 0; i < currentDay.weekday(); i += 1) {
    var prevDay = enableOutsideDays ? currentDay.clone().subtract(i + 1, 'day') : null;
    currentWeek.unshift(prevDay);
  }

  while (currentDay < lastOfMonth) {
    currentWeek.push(currentDay.clone());
    currentDay.add(1, 'd');

    if (currentDay.weekday() === 0) {
      weeksInMonth.push(currentWeek);
      currentWeek = [];
    }
  }

  // weekday() returns the index of the day of the week according to the locale
  // this means if the week starts on Monday, weekday() will return 0 for a Monday date, not 1
  if (currentDay.weekday() !== 0) {
    // days belonging to the next month
    for (var k = currentDay.weekday(), count = 0; k < 7; k += 1, count += 1) {
      var nextDay = enableOutsideDays ? currentDay.clone().add(count, 'day') : null;
      currentWeek.push(nextDay);
    }

    weeksInMonth.push(currentWeek);
  }

  return weeksInMonth;
}