ntChangeMonthNameInCalender.js

var a = jQuery(".ninja_filter_date_picker,.ninja_filter_date_range");
jQuery.each(a, function (t, e) {
    var n = jQuery(e);
    n.pikaday({
        format: n.data("date_format"),
        defaultDate: n.val(),
        i18n: {
            previousMonth : 'SPrevious Month', //Change Previous Month text here
            nextMonth     : 'SNext Month', //Change Next Month text here
            months        : ['SJanuary','February','March','April','May','June','July','August','September','October','November','December'], //Change Month (Fullname) text here
            weekdays      : ['SSunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'], ///Change Day Full name text here
            weekdaysShort : ['SSun','Mon','Tue','Wed','Thu','Fri','Sat'] //Change Day Short name text here
        },
    });
    
    moment.updateLocale('en', {
        monthsShort : [ "sJan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" ] //Change Month Short name text here
    });
});