Group by keyword ordering

Yaoliang Yu 8 ár síðan updated by David Knowles 7 ár síðan 1

The current group by keyword function by default orders the entries in ascending order. Is it possible to let the user control the ordering?

I am trying to use the field keyword to add a preprint section, along with each year in a separate section. Right now it works but I would prefer the preprint section appear in the beginning, then 2016, 2015, etc.

Thanks for any help!

Plus one for this, but I guess for now I'll just reorder my .bib.