var monthNames = new Array ("Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec");
var monthNumbers = { Jan:0,Feb:1,Mar:2,Apr:3,May:4,Jun:5,Jul:6,Aug:7,Sep:8,Oct:9,Nov:10,Dec:11 };
var dayNames = new Array ("Sun","Mon","Tue","Wed","Thu","Fri","Sat");
var dayNumbers = { Sun:0,Mon:1,Tue:3,Wed:4,Thu:5,Fri:6,Sat:7 };
var Jan=0,Feb=1,Mar=2,Apr=3,May=4,Jun=5,Jul=6,Aug=7,Sep=8,Oct=9,Nov=10,Dec=11;
var Sun=0,Mon=1,Tue=2,Wed=3,Thu=4,Fri=5,Sat=6;
var now = new Date ();
var year = now.getFullYear();
var cities = new Array ();
function getTheDateFor (_rule)
{
var month = 0, day=0;
// find the month
for (i = 0; i < 12; ++i)
if (_rule.indexOf(monthNames[i]) > -1)
{
// set month from month name in the rule
month = i;
// set day from date in the rule
var sub1 = _rule.substr(_rule.indexOf(monthNames[i]));
var sub2 = sub1.substr(sub1.indexOf(" "));
day = parseInt(sub2);
}
if (!isNaN(day))
{
// day has already been set from the rule
}
else if (_rule.indexOf("first") > -1)
{
day = 1;
while (1)
{
var date = new Date (year, month, day);
var dow = date.getDay();
if (dow == dayNumbers.Sun)
break;
++day;
}
// day is now date of 1st Sunday
}
else if (_rule.indexOf("second") > -1)
{
day = 7;
while (1)
{
var date = new Date (year, month, day);
var dow = date.getDay();
if (dow == dayNumbers.Sun)
break;
++day;
}
// day is now date of 2nd Sunday
}
else if (_rule.indexOf("third") > -1)
{
day = 14;
while (1)
{
var date = new Date (year, month, day);
var dow = date.getDay();
if (dow == dayNumbers.Sun)
break;
++day;
}
// day is now date of 3rd Sunday
}
else if (_rule.indexOf("last") > -1)
{
day = 31;
while (1)
{
var date = new Date (year, month, day);
var dow = date.getDay();
if (dow == dayNumbers.Sun)
break;
--day;
}
// day is now date of last Sunday
}
return new Date (year, month, day, 0, 0, 0);
}
function getTheHourFor (_rule)
{
// set the hour
if (_rule.indexOf("1am") > -1)
hour = 1;
else if (_rule.indexOf("2am") > -1)
hour = 2;
else if (_rule.indexOf("3am") > -1)
hour = 3;
else if (_rule.indexOf("4am") > -1)
hour = 4;
return hour;
}
function isDSTFor (_city)
{
var offset = _city.offset;
var now = new Date ();
var utcYear = now.getUTCFullYear();
var utcMonth = now.getUTCMonth();
var utcDate = now.getUTCDate();
var utcHours = now.getUTCHours();
var dateInCity = new Date (new Date (utcYear, utcMonth, utcDate, utcHours, 0, 0).getTime() + offset * 60 * 60 * 1000);
var cityStartDate = new Date (_city.dstStart.getTime() + _city.dstStartHour * 3600000);
var cityEndDate = new Date (_city.dstEnd.getTime() + _city.dstEndHour * 3600000);
var sum1 = (dateInCity > cityStartDate && dateInCity < cityEndDate) && !_city.dstReversed;
var sum2 = (dateInCity < cityEndDate || dateInCity > cityStartDate) && _city.dstReversed;
var result = _city.isDST = (sum1 || sum2) ? true : false;
_city.localDate = _city.isDST ? (new Date (dateInCity.getTime() + 3600000)) : dateInCity;
_city.isAM = _city.localDate.getHours() < 12 ? true : false;
return result;
}
var numClocks = 0;
function ClockCity (_name, _hoursFromUT, _DST_startDate, _DST_endDate, _dstReversed)
{
this.name = _name;
this.offset = _hoursFromUT;
this.dstObserved = (_DST_startDate && _DST_startDate > "") ? true : false;
this.dstStart = getTheDateFor(_DST_startDate);
this.dstStartHour = getTheHourFor(_DST_startDate);
this.dstEnd = getTheDateFor(_DST_endDate);
this.dstEndHour = getTheHourFor(_DST_endDate);
this.dstReversed = (_dstReversed) ? true : false;
//alert(this.dstStart + "\n" + this.dstEnd);
this.idx = numClocks++;
cities[this.idx] = this;
this.observing = isDSTFor(this);
return this;
}
var NewYork = new ClockCity ("New York", -5, "second Sunday in March at 2am", "first Sunday in November at 2am");
var London = new ClockCity ("London", 0, "last Sunday in March at 1am", "last Sunday in October at 1am");
var Paris = new ClockCity ("Paris", +1, "last Sunday in March at 1am", "last Sunday in October at 1am");
var Baghdad = new ClockCity ("Baghdad", +3, "April 1st at 3am", "August 1st at 3am");
var Mumbai = new ClockCity ("Mumbai", +5.5, "", ""); //NO DST
var Sydney = new ClockCity ("Sydney", +10, "last Sunday in October at 2am", "last Sunday in March at 2am", true);
function addSuffix (_n)
{
switch (_n)
{
case 1:
return _n + "st";
case 2:
return _n + "nd";
case 3:
return _n + "rd";
default:
return _n + "th";
}
}
function setClockTitle (_city)
{
var date = _city.localDate;
document.getElementById("clockTitle"+_city.idx).title = (_city.isAM ? "AM" : "PM") + " " + (_city.isDST ? "DST" : "") + " "
+ dayNames[date.getDay()] + " " + addSuffix(date.getDate()) + " " + monthNames[date.getMonth()] + " " + date.getFullYear();
}
function insertClock (_city)
{
var diameter = 70;
var timezoneOffset = _city.offset + (_city.isDST ? 1 : 0);
var newHTML = '';
newHTML += ' ';
newHTML += ' ';
newHTML += ' ';
newHTML += '