Hola, queria saber si hay algun codigo para poner un marcador ya sea en minutos, horas o dias que haga una cuenta atras?

Usa este, solo has de editar:

//enter the count up date using the format year/month/day
countup(2000,08,15)

El primer caracter es el año (4 digitos)
El segundo es el mes (2 digitos)
El tercero el dia (2 digitos)

Codigo PHP:

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<script>



var montharray=new Array("Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec")

function countup(yr,m,d){
var today=new Date()
var todayy=today.getYear()
var todaym=today.getMonth()
var todayd=today.getDate()
var todaystring=montharray[todaym]+" "+todayd+", "+todayy
var paststring=montharray[m-1]+" "+d+", "+yr
var difference=(Math.round((Date.parse(todaystring)-Date.parse(paststring))/(24*60*60*1000))*1)
difference+=" días"
document.write(""+difference+"")
}

//enter the count up date using the format year/month/day
countup(2000,08,15)
</script>


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Cuenta dias