rust2rpm is the only tool in Fedora that still generates the "new" format changelogs (including time and timezone). RPM upstream even discourages its use since it's apparently subtly broken and can't really be fixed.
https://pagure.io/fedora-rust/rust2rpm/pull-request/132 would fix this issue.
The PR was merged.
Metadata Update from @decathorpe: - Issue close_status updated to: Fixed - Issue status updated to: Closed (was: Open)
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