Date.now() resolution in Bangle.js 2

So resolution seems to be 1/32768 seconds.

Yes, that's right! Good detective work :)

Is there a more efficient way to get current time into same variable instance?

It's really not that bad... I think allocating Date uses 3 variables, and because of the way Espruino works that's pretty quick and not likely to cause any fragmentation.

You can do D.setTime(Date.now()) but I think it's of such a marginal improvement it's not worth it.