basic-javascript-09-WorldTimeConverter.htm / htm
<html>
<head>
<script language="javascript" type="text/javascript">
var timeDiff;
var selectedCity;
var daylightSavingAdjust = 0;
function window_onload()
{
updateTimeZone();
window.setInterval("updateTime()",1000);
}
function updateTimeZone()
{
var lstCity = document.form1.lstCity;
timeDiff = lstCity.options[lstCity.selectedIndex].value;
selectedCity = lstCity.options[lstCity.selectedIndex].text;
updateTime();
}
function getTimeString(dateObject)
{
var timeString;
var hours = dateObject.getHours();
if (hours < 10)
hours = "0" + hours;
var minutes = dateObject.getMinutes();
if (minutes < 10)
minutes = "0" + minutes;
var seconds = dateObject.getSeconds()
if (seconds < 10)
seconds = "0" + seconds;
timeString = hours + ":" + minutes + ":" + seconds;
return timeString;
}
function updateTime()
{
var nowTime = new Date();
var resultsFrame = window.top.resultsFrame.document;
resultsFrame.open()
resultsFrame.write("Local Time is " + getTimeString(nowTime) + "<br>");
nowTime.setMinutes(nowTime.getMinutes() + nowTime.getTimezoneOffset() +
parseInt(timeDiff) + daylightSavingAdjust);
resultsFrame.write(selectedCity + " time is " + getTimeString(nowTime));
resultsFrame.close();
}
function chkDaylightSaving_onclick()
{
if (document.form1.chkDaylightSaving.checked)
{
daylightSavingAdjust = 60;
}
else
{
daylightSavingAdjust = 0;
}
updateTime();
}
</script>
</head>
<body onload="return window_onload()">
<form name=form1>
<select size=5 name=lstCity language=JavaScript onchange="updateTimeZone();">
<option value=60 selected>Berlin
<option value=330>Bombay
<option value=0>London
<option value=180>Moscow
<option value=-300>New York (EST)
<option value=60>Paris
<option value=-480>San Francisco (PST)
<option value=600>Sydney
</select>
<p>
It's summer time in the selected city
and its country adjusts for summertime daylight saving
<input type="checkbox" name=chkDaylightSaving language=JavaScript
onclick="return chkDaylightSaving_onclick()">
</p>
</form>
</body>
</html>
(C) Æliens 20/2/2008
You may not copy or print any of this material without explicit permission of the author or the publisher. In case of other copyright issues, contact the author.
