Developers, please stop embedding (build) timestamps in binaries (including Android APKs). They are one of the most common reasons for builds not being reproducible. If you really need a timestamp, please use e.g. the timestamp of the last commit, not the current time during the build.
Also no UUIDs or nondeterministic ELF build-ids please. And please be careful with listing files or embedding lists of any kind: reading from the filesystem and the iteration order of hash maps etc. are usually nondeterministic. Sorting helps here. A lot :)
https://gitlab.com/IzzyOnDroid/repo/-/wikis/Reproducible-Builds