User-friendly timestamp formatting

formatTimeByHowRecent

function formatTimeByHowRecent(rawTimestamp) {
    var currentDate = new Date();
    //reference times for different displays
    var ref = new Date(currentDate.getFullYear(), currentDate.getMonth(), currentDate.getDate(), 0, 0, 0);
    var refday = new Date(currentDate.getFullYear(), currentDate.getMonth(), currentDate.getDate(), 0, 0, 0);
    var refdayNext = new Date(currentDate.getFullYear(), currentDate.getMonth(), currentDate.getDate(), 0, 0, 0);
    var refweek = new Date(currentDate.getFullYear(), currentDate.getMonth(), currentDate.getDate(), 0, 0, 0);
    refday.setDate(ref.getDate() - 1);
    refdayNext.setDate(ref.getDate() + 1);
    refweek.setDate(ref.getDate() - 7);

    var tdb = new Date(rawTimestamp);
    // MAKE SURE API/PHP RETURNS THE TIME AS $row['time_settle'] = date('j/n/Y',strtotime($row['time_settle']));
    //console.log(tdb)

    //adjust to time zone
    tdb.setMinutes(tdb.getMinutes());
    //date format
    if (tdb > ref && tdb < refdayNext) {
        var hours = tdb.getHours();
        var min = tdb.getMinutes();
        if (min < 10) {
            min = "0" + min;
        }
        if (hours == 0) {
            var ampm = "AM";
        } else if (hours < 12) {
            var ampm = "AM";
        } else if (hours == 12) {
            var ampm = "PM";
        } else {
            hours -= 12;
            var ampm = "PM";
        }
        var timeinsert = hours + ":" + min + " " + ampm;
    } else if (tdb > refday && tdb < refdayNext) {
        var timeinsert = "Yest";
    } else if (tdb > refweek && tdb < refdayNext) {
        var weekday = ["Sun", "Mon", "Tues", "Wedn", "Thur", "Fri", "Sat"][tdb.getDay()];
        var timeinsert = weekday;
    } else {
        var timeinsert = tdb.getDate() + "/" + (tdb.getMonth() + 1) + "/" + tdb.getFullYear().toString().substr(2, 2);
    }
    return timeinsert;
}