Yes, the Unix epoch is the obvious choice of birth date here

GitHub’s reporting functions are limited. For example, it’s not possible to report the issue or the reply from GitHub Actions. And the form for reporting the whole repository is somewhat broken and annoying to use

GitLab, Gitea and Codeberg

This is a single byte, so it’s represented the same in big-endian vs little-endian. Endianness defines the order of bytes, not individual bits

That’s the sign bit. The cake is in two’s complement