Feature or enhancement
This script was originally added during the implementation of PEP 495 in 5d0c598 by @albakin but is undocumented. I confirmed with @pganssle that it is no longer (and probably never was) used, I was also unable to find any mention of it in the PEP or discussion, so I gather it was a development aid.
The script has several issues, it uses deprecated datetime functions, doesn’t use zoneinfo and doesn’t support version 2/3 TZif files, which is because it hasn't been updated since it's initial commit (an unused import was removed in d6debb2 ). Its' functionality is also provided by zdump(8).
I propose removing this script.