Date() in different timezone

There's no way built into Date itself. I don't think it's part of the JS spec?

If it is then show me where and I'll be happy to add it to Espruino though.

You could change the timezone globally just while you access date:

var tz = (new Date()).getTimezoneOffset();
E.setTimeZone(6);
var d = new Date();
// access date here
E.setTimeZone(tz/60); // return to default

But IMO the most sane thing is just to add/subtract what you need from the hours:

var timezone = 1;
var d = new Date(Date.now()+timezone*3600000);
print(new Date(), d)
// Date: Wed Jul 1 2020 08:14:48 GMT+0000 
// Date: Wed Jul 1 2020 09:14:48 GMT+0000

It'll still report GMT+0000, but everything else is as you want it