Calculate the week # of the year
Calculates what the week number is for the year, according to the current date.
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Source Code
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>The week number of this year is....</title>
<meta name="author" content="DJ Hall">
<meta name="description" content="Find what week of the year it is.">
<script>
//to test change Date to Date(yyyy,mm,dd) Remember for the month, Jan = 00
now = new Date()
//Creates a date object that equals the first day of the current year.
curryearstart = new Date(now.getFullYear(),00,01)
//valueOf() returns the number of milliseconds passed since Midnight Jan 1, 1970.
//86400000 = Number of milliseconds in a day
dayselapsed = (now.valueOf() - curryearstart.valueOf()) / 86400000
//calculates what day of week the year started on and adds
//it to the number of days elapsed in the year.
weeknum = parseInt((dayselapsed + curryearstart.getDay()) / 7) + 1
document.write("Today, " + now.toString().slice(0,10) + ", is in week # " + "<span style='font-weight:bold;font-size:125%;color:firebrick'>" + weeknum + "</span> of the year " + now.getFullYear())
</script>
</head>
<body>
</body>
</html>
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