With today's spammers, the "Most users ever online" is almost always incorrect. Currently the only way to reset the number is with a SQL query in AdminCP>Maintenance>Execute manual SQL query. As Lynne said, if you screw this up you can be sorry. But you should be doing regular backups anyway.
The query (copy and paste!):
Quote:
UPDATE datastore SET data = '' WHERE title = 'maxloggedin';
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As to your date problem: Who knows. Check your server clock.