Date::Manip version 6.11

Hours: 
date: 2011103003:00:00     date-1h: 2011103002:00:00
date: 2011103003:00:00     date-2h: 2011103001:00:00
date: 2011103002:00:00     date-1h: 2011103001:00:00
date: 2011103002:00:00     date-2h: 2011103001:00:00
date: 2011103001:00:00     date-1h: 2011103001:00:00
date: 2011103001:00:00     date-2h: 2011103000:00:00
date: 2011103000:00:00     date-1h: 2011102923:00:00
date: 2011103000:00:00     date-2h: 2011102922:00:00

Days: 
mode=0
date: 2011110100:00:00     date-1d: 2011103100:00:00    err=0
date: 2011103100:00:00     date-1d: 2011103001:00:00    err=0
date: 2011103000:00:00     date-1d: 2011102900:00:00    err=0
mode=1
date: 2011110100:00:00     date-1d: 2011103100:00:00    err=0
date: 2011103100:00:00     date-1d: 2011103001:00:00    err=0
date: 2011103000:00:00     date-1d: 2011102900:00:00    err=0