[Zope] DateTime: Get DateTime-Objekt from german dateformat %d.%m.%Y

[Patrick Ulmer]

Hi,

i have a litte problem to insert my german dateformat into my 
SQL-Database, because I must convert it to ISO-Format. I try

datum=_.DateTime (wiedervorlage).ISO())

but day and month ar interchanged.

How can I convert my datestring '1.3.2005' to '2005-03-01'?

Thanks,
Patrick