Negative numbers! It's done!
Seconds: -105105581.113
Minutes: -1751759.68522
Hours: -29195.9947536
Days: -1216.4997814
Weeks: -173.785683057
Fortnights: -86.8928415286
Years: -3.33059488405
Decades: -0.333059488405
Centuries: -0.0333059488405
Millennia: -0.00333059488405