<!--
/**
 * Converts an xs:date or xs:dateTime formatted string into the local timezone
 * and outputs a human-readable form of this date or date/time.
 *
 * @param {string} gCalTime is the xs:date or xs:dateTime formatted string
 * @return {string} is the human-readable date or date/time string
 */
function formatGCalTime(gCalTime) { 
  // text for regex matches
  var remtxt = gCalTime;
  var dayNames = new Array();
    dayNames[0] = "Sunday";
    dayNames[1] = "Monday";
    dayNames[2] = "Tuesday";
    dayNames[3] = "Wednesday";
    dayNames[4] = "Thursday";
    dayNames[5] = "Friday";
    dayNames[6] = "Saturday";
  var monthNames = new Array();
    monthNames[0] = "January";
    monthNames[1] = "February";
    monthNames[2] = "March";
    monthNames[3] = "April";
    monthNames[4] = "May";
    monthNames[5] = "June";
    monthNames[6] = "July";
    monthNames[7] = "August";
    monthNames[8] = "September";
    monthNames[9] = "October";
    monthNames[10] = "November";
    monthNames[11] = "December";
    
  function consume(retxt) {
    var match = remtxt.match(new RegExp('^' + retxt));
    if (match) {
      remtxt = remtxt.substring(match[0].length);
      return match[0];
    }
    return '';
  }

  // minutes of correction between gCalTime and GMT
  var totalCorrMins = 0;

  var year = consume('\\d{4}');
  consume('-?');
  var month = consume('\\d{2}');
  consume('-?');
  var dateMonth = consume('\\d{2}');
  var timeOrNot = consume('T');

  // if a DATE-TIME was matched in the regex 
  if (timeOrNot == 'T') {
    var hours = consume('\\d{2}');
    consume(':?');
    var mins = consume('\\d{2}');
    consume('(:\\d{2})?(\\.\\d{3})?');
    var zuluOrNot = consume('Z');

    // if time from server is not already in GMT, calculate offset
    if (zuluOrNot != 'Z') {
      var corrPlusMinus = consume('[\\+\\-]');
      if (corrPlusMinus != '') {
        var corrHours = consume('\\d{2}');
        consume(':?');
        var corrMins = consume('\\d{2}');
        totalCorrMins = (corrPlusMinus=='-' ? 1 : -1) * 
            (Number(corrHours) * 60 + 
	    (corrMins=='' ? 0 : Number(corrMins)));
      }
    } 

    // get time since epoch and apply correction, if necessary
    // relies upon Date object to convert the GMT time to the local
    // timezone
    var originalDateEpoch = Date.UTC(year, month - 1, dateMonth, hours, mins);
    var gmtDateEpoch = originalDateEpoch + totalCorrMins * 1000 * 60;
    var ld = new Date(gmtDateEpoch);

    // date is originally in YYYY-MM-DD format
    // time is originally in a 24-hour format
    // this converts it to MM/DD hh:mm (AM|PM) 
    dateString = monthNames[ld.getMonth()] + '/' + ld.getDate() +', '+dayNames[ld.getDay()] + ' ' +
        ((ld.getHours()>12)?(ld.getHours()-12):(ld.getHours()===0?12:
	ld.getHours())) + ':' + ((ld.getMinutes()<10)?('0' + 
	ld.getMinutes()):(ld.getMinutes())) + ' ' + 
	((ld.getHours()>=12)?'PM':'AM');
  } else {
     var originalDateEpoch = Date.UTC(year, month - 1, dateMonth, 10, 10);
      var gmtDateEpoch = originalDateEpoch + totalCorrMins * 1000 * 60;
      var ld = new Date(gmtDateEpoch);
    // if only a DATE was matched
    dateString =  monthNames[ld.getMonth()] + '/' + parseInt(dateMonth, 10) + ', '+dayNames[ld.getDay()] ;
  }
  return dateString;
}

/**
 * Creates an unordered list of events in a human-readable form
 *
 * @param {json} root is the root JSON-formatted content from GData
 * @param {string} divId is the div in which the events are added
 */ 
function listEvents(root, divId) {
  var feed = root.feed;
  var events = document.getElementById(divId);

	while (events.childNodes.length>0){
		events.removeChild(events.childNodes[0]);
	}

  // create a new unordered list
  var ul = document.createElement('ul');
  var prevDate ="";

  // loop through each event in the feed
  for (var i = 0; i < feed.entry.length; i++) {
    var entry = feed.entry[i];
    var title = entry.title.$t;
    var start = entry['gd$when'][0].startTime;

    // get the URL to link to the event
    for (var linki = 0; linki < entry['link'].length; linki++) {
      if (entry['link'][linki]['type'] == 'text/html' &&
          entry['link'][linki]['rel'] == 'alternate') {
        var entryLinkHref = entry['link'][linki]['href']+"&ctz=America/Chicago";	//added &ctz=America/Chicago to link for correct timezone (Ben Ehmke | Feb 17, 2009)
		
      }
    }

    var dateString = formatGCalTime(start);
		var month = dateString.match(new RegExp('^[a-zA-Z0-9]+'));
		var day = dateString.match(new RegExp('[-/][0-9]+'));
		var dayString = ""+day;
		var dayname = dateString.match(new RegExp('[, ][a-zA-Z0-9]+'));
		var date = dayname + ', ' + month+ " " + dayString.substr(1);
		var time = dateString.match(new RegExp('[0-9]+:[0-9]+ [apmAPM]+'));
    var dateLi = document.createElement('li');
    var li = document.createElement('li');
    
    if(date != prevDate)
    {
      prevDate = ""+date;
      dateLi.className='date';
		  dateLi.appendChild(document.createTextNode(date));
		  ul.appendChild(dateLi);
		}
    // if we have a link to the event, create an 'a' element
    if (typeof entryLinkHref != 'undefined') {
      entryLink = document.createElement('a');
      entryLink.setAttribute('href', entryLinkHref);//added &ctz=America/Chicago to link for correct timezone (Ben Ehmke | Feb 17, 2009)
      entryLink.appendChild(document.createTextNode(title));
      if (time != null)
        li.appendChild(document.createTextNode(time + ' :: '));
      li.appendChild(entryLink);
    } else {
      li.appendChild(document.createTextNode(time + ' :: ' + title));
    }	    

    // append the list item onto the unordered list
    ul.appendChild(li);
  }
  events.appendChild(ul);
}

/**
 * Callback function for the GData json-in-script call
 * Inserts the supplied list of events into a div of a pre-defined name
 * 
 * @param {json} root is the JSON-formatted content from GData
 */ 
function insertAgenda(root) {
  listEvents(root, 'events');
}
//-->