I'm seeing it with all my macros. I've compressed them and kept them in the caravel repo so it's more easily rebuildable from the repo

Actually the script is already in open_pdks and has been for a while. See

common/change_gds_date.py

. Usage:

change_gds_date.py _create_stamp mod_stamp path_to_gds_in path_to_gds_out_

. I think mostly it has just been used to set both timestamps to zero. I'm not sure there's any tool that meaningfully uses the timestamps for anything.