Clock In JavaScript

MohanKandasamy

1.70/5 (8 votes)

Oct 7, 2004

4 min read

33570

JavaScript clock showing clock for different countries.

//author Kandasamy Mohan

<HEAD>
<SCRIPT LANGUAGE="JavaScript">
var timerID ;
function tzone(tz, os, ds, cl)
{
this.ct = new Date(0) ;  // datetime
this.tz = tz ;  // code
this.os = os ;  // GMT offset
this.ds = ds ;  // has daylight savings
this.cl = cl ;  // font color
}

function UpdateClocks()
{

var ct = new Array(

new tzone('SFO: ', -8, 1, 'red'),

new tzone('SL: ', +6, 0, 'pink'),

new tzone('HKG: ', +8, 0, 'silver'),

new tzone('BKK: ', +7, 0, '#FFAA00'),

new tzone('NYC: ', -5, 1, '#FFAA00'),

new tzone('LON: ', 0, 1, 'silver'),

new tzone('SVO: ', +3, 0, 'pink'),

new tzone('KTM: ', +5.75, 0, 'red')

) ;

var dt = new Date() ; // [GMT] time according to

machine clock

var startDST = new Date(dt.getFullYear(), 3, 1) ;

while (startDST.getDay() != 0)

startDST.setDate(startDST.getDate() + 1) ;

var endDST = new Date(dt.getFullYear(), 9, 31) ;

while (endDST.getDay() != 0)

endDST.setDate(endDST.getDate() - 1) ;

var ds_active ; // DS currently active

if (startDST < dt && dt < endDST)

ds_active = 1 ;

else

ds_active = 0 ;

// Adjust each clock offset if that clock has DS

and in DS.

for(n=0 ; n<ct.length ; n++)

if (ct[n].ds == 1 && ds_active == 1)

ct[n].os++ ;

// compensate time zones

gmdt = new Date() ;

for (n=0 ; n<ct.length ; n++)

ct[n].ct = new Date(gmdt.getTime() +

ct[n].os * 3600 * 1000) ;

document.all.Clock0.innerHTML =

'<font color="' + ct[0].cl + '">' +

ct[0].tz + ClockString(ct[0].ct) + '</font>' ;

document.all.Clock1.innerHTML =

'<font color="' + ct[1].cl + '">' +

ct[1].tz + ClockString(ct[1].ct) + '</font>' ;

document.all.Clock2.innerHTML =

'<font color="' + ct[2].cl + '">' +

ct[2].tz + ClockString(ct[2].ct) + '</font>' ;

document.all.Clock3.innerHTML =

'<font color="' + ct[3].cl + '">' +

ct[3].tz + ClockString(ct[3].ct) + '</font>' ;

document.all.Clock4.innerHTML =

'<font color="' + ct[4].cl + '">' +

ct[4].tz + ClockString(ct[4].ct) + '</font>' ;

document.all.Clock5.innerHTML =

'<font color="' + ct[5].cl + '">' +

ct[5].tz + ClockString(ct[5].ct) + '</font>' ;

document.all.Clock6.innerHTML =

'<font color="' + ct[6].cl + '">' +

ct[6].tz + ClockString(ct[6].ct) + '</font>' ;

document.all.Clock7.innerHTML =

'<font color="' + ct[7].cl + '">' +

ct[7].tz + ClockString(ct[7].ct) + '</font>' ;

timerID = window.setTimeout("UpdateClocks()", 1001)

;

}

function ClockString(dt)

{

var stemp, ampm ;

var dt_year = dt.getUTCFullYear() ;

var dt_month = dt.getUTCMonth() + 1 ;

var dt_day = dt.getUTCDate() ;

var dt_hour = dt.getUTCHours() ;

var dt_minute = dt.getUTCMinutes() ;

var dt_second = dt.getUTCSeconds() ;

dt_year = dt_year.toString() ;

if (0 <= dt_hour && dt_hour < 12)

{

ampm = 'AM' ;

if (dt_hour == 0) dt_hour = 12 ;

} else {

ampm = 'PM' ;

dt_hour = dt_hour - 12 ;

if (dt_hour == 0) dt_hour = 12 ;

}

if (dt_minute < 10)

dt_minute = '0' + dt_minute ;

if (dt_second < 10)

dt_second = '0' + dt_second ;

stemp = dt_month + '/' + dt_day + '/' +

dt_year.substr(2,2) ;

stemp = stemp + ' ' + dt_hour + ":" + dt_minute +

":" + dt_second + ' ' + ampm ;

return stemp ;

}

// End -->

</script>

</HEAD>

<!-- STEP TWO: Insert the onLoad event handler into your

BODY tag -->

<!-- STEP THREE: Copy this code into the BODY of your HTML

document -->

<tr bgcolor=white style="font-family: Verdana, Tahoma,

Arial; font-size: x-small">

</tr>

<tr bgcolor="white" style="font-family: Verdana, Tahoma,

Arial; font-size: x-small">

</tr>

</table>