function bestDateString(sourceDate){
    if (!sourceDate) return '';

    var date = Date.create(sourceDate);

    if (date.isYesterday()) return 'Yesterday';
    if (date.isToday()) return 'Today';
    if (date.isTomorrow()) return 'Tomorrow';
    if (date.isAfter(Date.create('tomorrow')) && date.isBefore(Date.create().addDays(7))) return date.format('{Weekday}');

    return date.format('{MM}/{dd}/{yyyy}');
}