about date

date
Thu Jan  3 07:42:47 PST 2008
date --date=now
Thu Jan  3 07:42:47 PST 2008
date --date=today # same thing
Thu Jan  3 07:42:47 PST 2008
date --date='3 seconds'
Thu Jan  3 07:42:50 PST 2008
date --date='3 seconds ago'
Thu Jan  3 07:42:44 PST 2008
date --date='4 hours'
Thu Jan  3 11:42:47 PST 2008
date --date='tomorrow'
Fri Jan  4 07:42:47 PST 2008
date --date='1 day'
Fri Jan  4 07:42:47 PST 2008
date --date='1 days'
Fri Jan  4 07:42:47 PST 2008
date --date='yesterday'
Wed Jan  2 07:42:47 PST 2008
date --date='1 day ago'
Wed Jan  2 07:42:47 PST 2008
date --date='1 days ago'
Wed Jan  2 07:42:47 PST 2008
date --date='1 week'
Thu Jan 10 07:42:47 PST 2008
date --date='1 fortnight'
Thu Jan 17 07:42:47 PST 2008
date --date='1 month'
Sun Feb  3 07:42:47 PST 2008
date --date='1 year'
Sat Jan  3 07:42:47 PST 2009