Javascript Number toS()

function numberToPx(number) {
 return number + "px"; 
}

function getMilliseconds(timestampStr) {
 var timestampStrSplit = timestampStr.split(".");
 var milli = Date.parse("January 1, 1970 " + timestampStrSplit[0] + " UTC");
 if (timestampStrSplit.length == 1)
  return milli;/* w w w  .  j  a v  a2s .co m*/
 else (timestampStrSplit.length == 2)
  return milli + parseInt(timestampStrSplit[1] * 100);
}

function getSeconds(timestampStr) {
 return getMilliseconds(timestampStr) / 1000;
}

Number.prototype.toS = function() {
 return this.valueOf() / 1000;
}

Number.prototype.toMS = function() {
 return ~~(this.valueOf() * 1000);
}