function getFriendActivity(startDate, daysSince, callback) {
    if (typeof startDate === "number") {
        callback = daysSince;
        daysSince = startDate;
        startDate = new Date();
        startDate.setHours(0);
        startDate.setMinutes(0);
        startDate.setSeconds(0);
        startDate = Math.floor(startDate.valueOf() / 1000);
    }
    daysSince *= 250;

    this.httpRequestGet("https://steamcommunity.com/id/royalgamer06/ajaxgetusernews?start=" + startDate + "&startoffset=" + daysSince, (error, response, data) => { /* Parsing result, error and callback handling */ });
}