react-dates/lib/utils/getNumberOfCalendarMonthWeeks.js

A responsive and accessible date range picker component built with React

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports['default'] = getNumberOfCalendarMonthWeeks;

var _moment = require('moment');

var _moment2 = _interopRequireDefault(_moment);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }

function getBlankDaysBeforeFirstDay(firstDayOfMonth, firstDayOfWeek) {
  var weekDayDiff = firstDayOfMonth.day() - firstDayOfWeek;
  return (weekDayDiff + 7) % 7;
}

function getNumberOfCalendarMonthWeeks(month) {
  var firstDayOfWeek = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : _moment2['default'].localeData().firstDayOfWeek();

  var firstDayOfMonth = month.clone().startOf('month');
  var numBlankDays = getBlankDaysBeforeFirstDay(firstDayOfMonth, firstDayOfWeek);
  return Math.ceil((numBlankDays + month.daysInMonth()) / 7);
}