tz = {
	"ACDT" : { "fullname" : "Australian Central Daylight Time", "offset" : "+10:30" },
	"ACST" : { "fullname" : "Australian Central Standard Time", "offset" : "+9:30" },
	"ADT" : { "fullname" : "Atlantic Daylight Time", "offset" : "-3:00" },
	"AEDT" : { "fullname" : "Australian Eastern Daylight Time", "offset" : "+11:00" },
	"AEST" : { "fullname" : "Australian Eastern Standard Time", "offset" : "+10:00" },
	"AKDT" : { "fullname" : "Alaska Daylight Time", "offset" : "-8:00" },
	"AKST" : { "fullname" : "Alaska Standard Time", "offset" : "-9:00" },
	"AST" : { "fullname" : "Atlantic Standard Time", "offset" : "-4:00" },
	"AWDT" : { "fullname" : "Australian Western Daylight Time", "offset" : "+9:00" },
	"AWST" : { "fullname" : "Australian Western Standard Time", "offset" : "+8:00" },
	"BST" : { "fullname" : "British Summer Time", "offset" : "+1:00" },
	"CAT" : { "fullname" : "Central Africa Time", "offset" : "+2:00" },
	"CDT" : { "fullname" : "Central Daylight Time", "offset" : "-5:00" },
	"CEDT" : { "fullname" : "Central European Daylight Time", "offset" : "+2:00" },
	"CEST" : { "fullname" : "Central European Summer Time", "offset" : "+2:00" },
	"CET" : { "fullname" : "Central European Time", "offset" : "+1:00" },
	"CST" : { "fullname" : "Central Summer(Daylight) Time", "offset" : "+10:30" },
	"CST" : { "fullname" : "Central Standard Time", "offset" : "+9:30" },
	"CST" : { "fullname" : "Central Standard Time", "offset" : "-6:00" },
	"CXT" : { "fullname" : "Christmas Island Time", "offset" : "+7:00" },
	"EDT" : { "fullname" : "Eastern Daylight Time", "offset" : "-4:00" },
	"EEDT" : { "fullname" : "Eastern European Daylight Time", "offset" : "+3:00" },
	"EEST" : { "fullname" : "Eastern European Summer Time", "offset" : "+3:00" },
	"EET" : { "fullname" : "Eastern European Time", "offset" : "+2:00" },
	"EST" : { "fullname" : "Eastern Summer(Daylight) Time", "offset" : "+11:00" },
	"EST" : { "fullname" : "Eastern Standard Time", "offset" : "+10:00" },
	"EST" : { "fullname" : "Eastern Standard Time", "offset" : "-5:00" },
	"GMT" : { "fullname" : "Greenwich Mean Time", "offset" : "+0:00" },
	"HAA" : { "fullname" : "Heure AvancŽe de l'Atlantique", "offset" : "-3:00" },
	"HAC" : { "fullname" : "Heure AvancŽe du Centre", "offset" : "-5:00" },
	"HADT" : { "fullname" : "Hawaii-Aleutian Daylight Time", "offset" : "-9:00" },
	"HAE" : { "fullname" : "Heure AvancŽe de l'Est", "offset" : "-4:00" },
	"HAP" : { "fullname" : "Heure AvancŽe du Pacifique", "offset" : "-7:00" },
	"HAR" : { "fullname" : "Heure AvancŽe des Rocheuses", "offset" : "-6:00" },
	"HAST" : { "fullname" : "Hawaii-Aleutian Standard Time", "offset" : "-10:00" },
	"HAT" : { "fullname" : "Heure AvancŽe de Terre-Neuve", "offset" : "-2:30" },
	"HAY" : { "fullname" : "Heure AvancŽe du Yukon", "offset" : "-8:00" },
	"HNA" : { "fullname" : "Heure Normale de l'Atlantique", "offset" : "-4:00" },
	"HNC" : { "fullname" : "Heure Normale du Centre", "offset" : "-6:00" },
	"HNE" : { "fullname" : "Heure Normale de l'Est", "offset" : "-5:00" },
	"HNP" : { "fullname" : "Heure Normale du Pacifique", "offset" : "-8:00" },
	"HNR" : { "fullname" : "Heure Normale des Rocheuses", "offset" : "-7:00" },
	"HNT" : { "fullname" : "Heure Normale de Terre-Neuve", "offset" : "-3:30" },
	"HNY" : { "fullname" : "Heure Normale du Yukon", "offset" : "-9:00" },
	"IST" : { "fullname" : "Irish Summer Time", "offset" : "+1:00" },
	"MDT" : { "fullname" : "Mountain Daylight Time", "offset" : "-6:00" },
	"MESZ" : { "fullname" : "MitteleuropŠische Sommerzeit", "offset" : "+2:00" },
	"MEZ" : { "fullname" : "MitteleuropŠische Zeit", "offset" : "+1:00" },
	"MST" : { "fullname" : "Mountain Standard Time", "offset" : "-7:00" },
	"NDT" : { "fullname" : "Newfoundland Daylight Time", "offset" : "-2:30" },
	"NFT" : { "fullname" : "Norfolk (Island) Time", "offset" : "+11:30" },
	"NST" : { "fullname" : "Newfoundland Standard Time", "offset" : "-3:30" },
	"PDT" : { "fullname" : "Pacific Daylight Time", "offset" : "-7:00" },
	"PST" : { "fullname" : "Pacific Standard Time", "offset" : "-8:00" },
	"UTC" : { "fullname" : "Coordinated Universal Time", "offset" : "+0:00" },
	"WEDT" : { "fullname" : "Western European Daylight Time", "offset" : "+1:00" },
	"WEST" : { "fullname" : "Western European Summer Time", "offset" : "+1:00" },
	"WET" : { "fullname" : "Western European Time", "offset" : "+0:00" },
	"WST" : { "fullname" : "Western Summer(Daylight) Time", "offset" : "+9:00" },
	"WST" : { "fullname" : "Western Standard Time", "offset" : "+8:00" }
}
 
function getEventDate(formDateField) {
	// I'm aware of Date.parse; my notes suggest that the Date object 
	// cannot be trusted, so i'm parsing it myself.

	// Expected format: YYYY-MM-DDThh:mm:ss.zzz
	year = formDateField.substring(0,4);
	month = formDateField.substring(5,7) - 1; // Date objects assume January's the 0th month :-P
	day = formDateField.substring(8,10);
	hours = formDateField.substring(11,13);
	minutes = formDateField.substring(14,16);
	seconds = formDateField.substring(17,19);

	return new Date(year, month, day, hours, minutes, seconds);
}

function getTimeDifference(myTZ, eventTZ) {
	return tzOffsetToMsec(myTZ) - tzOffsetToMsec(eventTZ);
}

function tzOffsetToMsec(tz) {
	var offset_dir = (tz.charAt(0) == "-")? -1:1;
	var time = tz.substring(1,6).split(/:/)

	var hour = time[0];
	var min = time[1];

	var mins_in_hour = 60;
	var secs_in_min = 60;
	var ms_in_sec = 1000;

	return ( ( hour * mins_in_hour * secs_in_min * ms_in_sec ) + ( min * secs_in_min * ms_in_sec ) ) * offset_dir; // in msec
}

function adjustTime(startDate, endDate, myTZ, eventTZ, elementOnPage) {
	startDate = getEventDate(startDate).getTime(); // convert to msec
	endDate = getEventDate(endDate).getTime(); // convert to msec
	timeDifference = getTimeDifference(myTZ, tz[eventTZ].offset);
	adjustedStartEventDate = new Date( startDate + timeDifference );
	adjustedEndEventDate = new Date( endDate + timeDifference );

	$(elementOnPage).innerHTML = formatDate( adjustedStartEventDate, adjustedEndEventDate );
	Element.show(elementOnPage);

}

function formatDate(startDateObj, endDateObj){
	var month = new Array( "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" );
	if (startDateObj.getFullYear() == endDateObj.getFullYear() && startDateObj.getMonth() == endDateObj.getMonth() && startDateObj.getDate() == endDateObj.getDate()) {
		return new Array( month[startDateObj.getMonth()], " ", startDateObj.getDate(), ", ", startDateObj.getFullYear(), "<br />", sanitizeTime(startDateObj), " through ",  sanitizeTime(endDateObj) ).join('');
	} else {
		return new Array( month[startDateObj.getMonth()], " ", startDateObj.getDate(), ", ", startDateObj.getFullYear(), " at ", sanitizeTime(startDateObj), " through ", month[endDateObj.getMonth()], " ", endDateObj.getDate(), ", ", endDateObj.getFullYear(), " at ",  sanitizeTime(endDateObj) ).join('');
	}
}

function sanitizeTime(dateObj) {
	ampm = "AM"
	h = dateObj.getHours();
	m = dateObj.getMinutes();

	if ( h == 0 ) {
		h = 12;
	} else if ( h == 12 ) {
	 ampm = "PM";
	} else if ( h > 12 ) {
		ampm = "PM";
		h = h - 12;
	}

	if ( m < 10 ) {
		m = "0" + m;
	}

	return h + ":" + m + " " + ampm;

}