moment.locale('ja');

// the default output format for `.toString()` and `field` value
format: 'YYYY/MM/DD',

// first day of week (0: Sunday, 1: Monday etc)
firstDay: 0,
 
// Additional text to append to the year in the calendar title
yearSuffix: '年',
 
// Render the month after year in the calendar title
showMonthAfterYear: true,
 
// Render days of the calendar grid that fall in the next or previous month
showDaysInNextAndPreviousMonths: true,
 
// internationalization
i18n: {
    previousMonth: '前月',
    nextMonth: '次月',
    months: moment.localeData()._months,
    weekdays: moment.localeData()._weekdays,
    weekdaysShort: moment.localeData()._weekdaysShort
}