Strange numbers

How to put a countdown of 8 seconds?
I’m trying some ways and always show strange numbers like 52678 seconds..

I am trying

[counter date=+0:0:o:o8]
Just [remaining-timer]![after]Countdown ended!
[/counter]

or

[counter date=YYYY/MM/DD-hh:mm:08]
Just [remaining-timer]![after]Countdown ended!
[/counter]

or

[counter date=0000/00/00-00:00:08]
Just [remaining-timer]![after]Countdown ended!
[/counter]

I try other codes too, but always show strange numbers like 23456 seconds for example.

I want put these code on download links like rapidshare, ul.to sites

Please, help me, because i love the plugin, but dont working for me.

https://ww.wp.xz.cn/plugins/easy-timer/