Prototype ¬ Detail

author: klaut [+], Submitted: 02.22.03 6a

function listDates (dayName, backToYear) {
	var dayNames =["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];
	var dayNum;
	for (var i=0; i<dayNames.length; i++) {
		if (dayNames[i].toLowerCase() == dayName.toLowerCase()) dayNum = i;			
	}
	var tempDate = new Date();
	var year = tempDate.getFullYear();
	var month = tempDate.getMonth();
	var dayNumToday = tempdate.getDay();
	var today = tempdate.getDate();
	var amount = Math.abs(dayNumToday - dayNum);
	(amount) ? (today -=amount) : (today = today); //(today -=7)
	tempDate.setFullYear(year, month, today);
	var counter;
	var week = 7*86400000;
	do {
		month = ((tempDate.getMonth()+1)>9) ? (tempDate.getMonth()+1) : "0"+(tempDate.getMonth()+1);
		today = (tempDate.getDate()>9) ? tempDate.getDate() : "0"+tempDate.getDate();
		var traceString = year + "-" + month + "-" + today + ", " + dayNames[tempDate.getDay()];
		trace (traceString);
		//trace (tempDate);
		counter = tempDate.getTime() - week;
		tempDate.setTime(counter);
		year = tempDate.getFullYear();
	} while (year >= backToYear);
}

usage

what it does is:
it counts backwards from today till the given year (included)
and traces the dates for the given day (sunday, monday... etc etc)
usage:
[code]
myDay="saturday";
listDates (myDay, 2002);

//trace output is:
2003-02-22, Saturday
2003-02-15, Saturday
2003-02-08, Saturday
2003-02-01, Saturday
2003-01-25, Saturday
2003-01-18, Saturday
2003-01-11, Saturday
2003-01-04, Saturday
2002-12-28, Saturday
2002-12-21, Saturday
2002-12-14, Saturday
2002-12-07, Saturday
2002-11-30, Saturday
2002-11-23, Saturday
2002-11-16, Saturday
2002-11-09, Saturday
2002-11-02, Saturday
2002-10-26, Saturday
2002-10-19, Saturday
2002-10-12, Saturday
2002-10-05, Saturday
2002-09-28, Saturday
2002-09-21, Saturday
2002-09-14, Saturday
2002-09-07, Saturday
2002-08-31, Saturday
2002-08-24, Saturday
2002-08-17, Saturday
2002-08-10, Saturday
2002-08-03, Saturday
2002-07-27, Saturday
2002-07-20, Saturday
2002-07-13, Saturday
2002-07-06, Saturday
2002-06-29, Saturday
2002-06-22, Saturday
2002-06-15, Saturday
2002-06-08, Saturday
2002-06-01, Saturday
2002-05-25, Saturday
2002-05-18, Saturday
2002-05-11, Saturday
2002-05-04, Saturday
2002-04-27, Saturday
2002-04-20, Saturday
2002-04-13, Saturday
2002-04-06, Saturday
2002-03-30, Saturday
2002-03-23, Saturday
2002-03-16, Saturday
2002-03-09, Saturday
2002-03-02, Saturday
2002-02-23, Saturday
2002-02-16, Saturday
2002-02-09, Saturday
2002-02-02, Saturday
2002-01-26, Saturday
2002-01-19, Saturday
2002-01-12, Saturday
2002-01-05, Saturday
[/code]
it traces ok back till the year 1812 (well, how fast it does depends on your machine, i guess) 
.. after that the output window drops the traces at the beginning,
but i guess that's because the trace output window can handle only certain amount of lines? ....