javascript、php与mysql时间格式化函数

/*
@desc：时间友好显示函数
@param stamp 时间缀，10位长度
*/
function timefriend(stamp){
this.stamp = stamp
/*
 @desc：主方法，执行转换
 */
this.get = function(){
    var stamp = this.stamp
    if(!stamp){
        return '—';
    }
    var date = new Date(stamp*1000)
    var time = Math.round(new Date().getTime()/1000)
    diff = time - stamp
    if(diff<0){
        return '—';
    }else if(diff<60){
        return diff+'秒前'
    }else if(diff<3600){
        return Math.floor(diff/60)+'分钟前'
    }else if(diff<86400){
        return Math.floor(diff/3600)+'小时前'
    }else if(diff<259200){
        return Math.floor(diff/86400)+'天前'
    }else{
        var year = this.parsetime(date.getFullYear())
        var month = this.parsetime(date.getMonth())
        var day = this.parsetime(date.getDate())
        var hour = this.parsetime(date.getHours())
        var minute = this.parsetime(date.getMinutes())
        var second = this.parsetime(date.getSeconds())
        var ret = year+'-'+month+'-'+day+' '+hour+':'+minute+':'+second
        return ret
    }
}
this.parsetime = function(input){
    var ret
    if(input >= 0 && input < 10){
        ret = '0'+input
    }else{
        ret = input
    }
    return ret
}
}
var timefriend = new timefriend('1428593779')
console.log(timefriend.get())

/*
@desc：显示某一个时间相当于当前时间在多少秒前，多少分钟前，多少小时前
@param  stamp      时间戳
@param  format     时间显示格式，默认Y-m-d H:i:s
@return 如      5秒前
*/
function timefriend($stamp,$format = 'Y-m-d H:i:s'){
if(empty($stamp)||!is_numeric($stamp)||!$stamp){
    return '—';
}
$diff = time() - $stamp;
if($diff<0){
    return '—';
}elseif($diff<60){
    return $diff.'秒前';
}elseif($diff<3600){
    return floor($diff/60).'分钟前';
}elseif($diff<86400){
    return floor($diff/3600).'小时前';
}elseif($diff<259200){
    return floor($diff/86400).'天前';
}else{
    return date($format,$stamp);
}
}

DELIMITER //
CREATE FUNCTION friendlyDate(sTime char(11))
RETURNS char(11)
BEGIN
if sTime='' then
    return '-';
end if;
set @cTime=UNIX_TIMESTAMP();
set @dTime=@cTime-sTime;
set @dDay=DATE_FORMAT(@cTime,'%e')-DATE_FORMAT(@sTime,'%e');
set @dYear=DATE_FORMAT(@cTime,'%Y')-DATE_FORMAT(@sTime,'%Y');
if @dTime>0 then
    if @dTime<60 then
        if @dTime<10 then
            return '刚刚';
        else
            set @t=floor(@dTime/10)*10;
            set @ret=concat(@t,'秒前');
            return @ret;
        end if;
    elseif @dTime<3600 then
        set @t=@dTime/60;
        set @ret=concat(@t,'分钟前');
        return @ret;
    elseif @dYear=0 && @dDay=0 then
        set @t=DATE_FORMAT(@sTime,'%H:%i');
        set @ret=concat('今天',@t);
        return @ret;
    elseif @dYear=0 then
        return DATE_FORMAT(@sTime,'%m月%d日 %H:%i');
    else
        return DATE_FORMAT(@sTime,'%Y-%m-%d %H:%i:%s');
    end if;
else
    return DATE_FORMAT(@sTime,'%Y年%m月%d日 %H:%i');
end if;
END
//
DELIMITER ;