Date Format in condition

<script language="javascript">
<!--
today = new date();
todayDay = today.getdate();
todayMon = today.getMonth();
todayYear = today.getYear();
todayDay = todayDay - 1;
if (todayYear < 2000) todayYear += 1900;

if (todayMon == 0) { todayMonth = "January"; }
else if (todayMon == 1) { todayMonth = "February"; }
else if (todayMon == 2) { todayMonth = "March"; }
else if (todayMon == 3) { todayMonth = "April"; }
else if (todayMon == 4) { todayMonth = "May"; }
else if (todayMon == 5) { todayMonth = "June"; }
else if (todayMon == 6) { todayMonth = "July"; }
else if (todayMon == 7) { todayMonth = "August"; }
else if (todayMon == 8) { todayMonth = "September"; }
else if (todayMon == 9) { todayMonth = "October"; }
else if (todayMon == 10) { todayMonth = "November"; }
else if (todayMon == 11) { todayMonth = "December"; }
else { todayMonth = todayMon; }

document.write(todayMonth + " " + todayDay + ", " + todayYear);