src/content/images_www/js/timeline_2.3.0/timeline_js/scripts/l10n/zh/labellers.js

/*==================================================
 *  Localization of labellers.js
 *==================================================
 */

Timeline.GregorianDateLabeller.monthNames["zh"] = [
    "1月", "2月", "3月", "4月", "5月", "6月", "7月", "8月", "9月", "10月", "11月", "12月"
];

Timeline.GregorianDateLabeller.labelIntervalFunctions["zh"] = function(date, intervalUnit) {
    var text;
    var emphasized = false;
    
    var date2 = Timeline.DateTime.removeTimeZoneOffset(date, this._timeZone);
    
    switch(intervalUnit) {
    case Timeline.DateTime.DAY:
    case Timeline.DateTime.WEEK:
        text = Timeline.GregorianDateLabeller.getMonthName(date2.getUTCMonth(), this._locale) + 
            date2.getUTCDate() + "日";
        break;
    default:
        return this.defaultLabelInterval(date, intervalUnit);
    }
    
    return { text: text, emphasized: emphasized };
};