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

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

Timeline.GregorianDateLabeller.monthNames["en"] = [
    "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
];

Timeline.GregorianDateLabeller.dayNames["en"] = [
    "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
];