About 11 000 revisions on the Chinese Wikisource have timestamps from January 1970 (which seems like a Unix epoch bug) and January 2001. Rev 254184 and rev 187693 are representative. The rev_ids of these revisions all seem to be six digits, suggesting that they were actually made in 2008 or later.
As best I can tell, the wiki was created around November 2003. Chinese Wikisource seems to be the only wiki with this kind of weird timestamping in the revision table
SELECT COUNT(*) FROM zhwikisource.revision WHERE rev_timestamp < "20030711085956"; +----------+ | COUNT(*) | +----------+ | 11277 | +----------+ 1 row in set (0.00 sec)
SELECT LEFT(rev_timestamp, 6) AS month, rev_user_text, rev_user, COUNT(*) FROM zhwikisource.revision WHERE rev_timestamp < "20030711085956" GROUP BY month, rev_user_text; +--------+---------------+----------+----------+ | month | rev_user_text | rev_user | COUNT(*) | +--------+---------------+----------+----------+ | 197001 | Liangent | 3087 | 1 | | 197001 | Wmr-bot | 4959 | 547 | | 197001 | Wmrwiki | 2632 | 30 | | 199911 | Wmrwiki | 2632 | 1 | | 199912 | Wmrwiki | 2632 | 2 | | 200101 | | 0 | 9456 | | 200101 | Wmr-bot | 4959 | 1239 | | 200101 | Wmrwiki | 2632 | 1 | +--------+---------------+----------+----------+ 8 rows in set (0.37 sec)