convert mm/dd/YYYY to timestamp in javascript

<script>
function toUnixStamp(str)
{
    var s=str.split("/");
      if(s.length>1)return (new Date(Date.UTC(s[2],s[0],s[1],0,0,0)).getTime()/1000.0);
}
</script>
<button onclick=alert(toUnixStamp("10/22/2004"))>convert 10/22/2004 to unixstamp</button>

thank you, but that function appears to return the next month minus one day.

Thanks, works good.

function toUnixStamp(str)
{
   var s=str.split("/");
   if(s.length>1)return (new Date(Date.UTC(s[2],(s[0]*1-1),s[1]*1+1,0,0,0)).getTime()/1000.0);
}

I don't know why, but that function ended up giving me the timestamp for the day before the date I entered. I changed it to fix the problem, but I still don't know why it gave me the wrong day:

function toUnixStamp(str) // Converts mm/dd/yyyy format to Unix timestamp
{
   var s=str.split("/");
    if(s.length>1)return (new Date(Date.UTC(s[2],(s[0]*1-1),(s[1]*1+1),0,0,0)).getTime()/1000.0);
};

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