JavaScript calculating the remaining days of the month (day calculator) sample code

<script language="JavaScript">

<!-- Begin
var today = new Date();
var now = ();
var year = ();
if (year < 2000) year += 1900; // Y2K fix
var month = ();

var monarr = new Array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);

// check for leap year
if (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) monarr[1] = "29";

// display day left
("There is still left in this month" + (monarr[month]-now) + "It's heaven");
//  End -->
</script>