- According to the trash specification (https://specifications.freedesktop.org/trash-spec/trashspec-latest.html) mtime field is number of SECONDS since epoch. But it seems KIO's implementation (https://github.com/KDE/kio/blob/master/src/ioslaves/trash/trashsizecache.cpp#L56) stores milliseconds since epoch therefore causing compatibility issue with other implementations. - Also FYI specification is vague about whether mtime include leap seconds or not.