How to set the timezone on the Pico

I'm afraid it's not quite as easy as changing the zimezone at the moment (I've just filed a bug for it). You can however just change the way the date is created, to create a date that's a few hours in the future or past:

var timeZone = 2;
var t = new Date(Date.now()+3600000*timeZone);
console.log(t.toString());