I am lost....

using
  sel_start_date = DateTime.new(sd.year,sd.month,sd.day,16,0,0)
if I display it I have  sel_start_date.to_s =>    "2006-10-19T16:00:00Z"

but I cannot performed correct searches into my MySQL DB (4.1.23) on 
datetime columns

It seems that I need to use strings like "2006-10-19 16:00:00" in the 
WHERE clause...
( I tried using manual queries with this format and it runs...)

what is the best startegy to use datetime correctly between Ruby and MySQL ?

thanks

Kad