[web2py] how to round the number of seconds

[dorasan]

Hello everyone.

Could you tell me how to round the number of seconds which
'request.now' represents like this

'2011-06-25 15:26:55.881000'   =>  '2011-06-25 15:26:55' or
'2011-06-25 15:26:56'

thank you

dorasan