New submission from Petr Viktorin <>:

The ZIP format cannot handle times before 1980.
Issue6090 provided a nice error message for trying to add such files.

I'm seeing a system for reproducible builds that sets mtime to 1970 (zero UNIX 
timestamp), resulting in files that Python can't package into (zip-based) 

At least here on Fedora, the `zip` command-line utility silently bumps old 
timestamps to 1980-01-01. Of course, silently corrupting data would not be good 
default behavior for Python.
But in many cases timestamps don't matter. It would be nice to give ZipFile and 
ZipFile.write() a `strict_timestamps=True` keyword argument that could be 
turned off.

components: Library (Lib)
messages: 321460
nosy: petr.viktorin
priority: normal
severity: normal
status: open
title: ZIP does not support timestamps before 1980
versions: Python 3.8

Python tracker <>
Python-bugs-list mailing list

Reply via email to