You cannot do this with JavaScript since it takes the system time which displays the current date with Date object. However, you can change the current date by changing the timezone as in the following code −
Example
<!DOCTYPE html>
<html>
<body>
<script>
var date, offset, nd;
date = new Date();
document.write("Current: "+date);
utc = date.getTime() + (date.getTimezoneOffset() * 60000);
// Singapore is GMT+8
offset = 8;
nd = new Date(utc + (3600000*offset));
document.write("<br>Singapore Time: "+nd.toLocaleString());
</script>
</body>
</html>Output
