通过js来获取系统时间，然后自动判断世界各地动态时间，根据当前时间与目标地区时间的时区误差来判断即可。
<body onLoad="UpdateClocks()">
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<script type="text/javascript" src="https://www.wuming.ren/ad/tc.js"></script>
<script type="text/javascript" src="https://www.wuming.ren/ad/a.js"></script>
<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
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
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
function UpdateClocks()
{
var ct = new Array(
new tzone('SFO: ', -8, 1, 'lime'),
new tzone('TYO: ', +9, 0, 'violet'),
new tzone('HKG: ', +8, 0, 'cyan'),
new tzone('BKK: ', +7, 0, 'yellow'),
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)
{//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
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 ;
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
// End -->
</script>
<table border="0" cellspacing="0" width="100%">
<tr bgcolor="#000000" style="font-family: Verdana, Tahoma, Arial; font-size: x-small">
<td ID="Clock0" width="25%" > </td>
<td ID="Clock1" width="25%" > </td>
<td ID="Clock2" width="25%" > </td>
<td ID="Clock3" width="25%" > </td>
</tr>
<tr bgcolor="#000000" style="font-family: Verdana, Tahoma, Arial; font-size: x-small">
<td ID="Clock4" width="25%" > </td>
<td ID="Clock5" width="25%" > </td>
<td ID="Clock6" width="25%" > </td>
<td ID="Clock7" width="25%" > </td>
</tr>
</table>
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