• I am on the latest Poetry version.
• I have searched the issues of this repo and believe that this is not a duplicate.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: Ubuntu 18.04.1 LTS
• Poetry version: 0.12.10
• Link of a Gist with the contents of your pyproject.toml file:

Issue

poetry build creates an sdist tarball. If you unpack that tarball, both the setup.py file and the PKG-INFO file have an mtime of 0. ctime and atime are set properly.

This is clearly visible if you do an ls -al in the unpacked tarball directory. Or you can do stat -c '%X %Y %Z' setup.py.

This should repro with any pyproject.toml but if it doesn't, happy to upload mine.