Error : String was not recognized as a valid DateTime.Couldn't store

Hi

I am getting error when reading DateTime type data from list.

Getting error at line

DataTable dt = searchList.GetItems(query).GetDataTable();

Error : String was not recognized as a valid DateTime.Couldn't store <2010-08-31 17:00:00:000> in rt_start Column.  Expected type is DateTime.

Here is my list structure

CAML Query that I am passing

<Where>

                <And>

                                <Geq><FieldRef Name='rt_start' /><Value Type='DateTime' IncludeTimeValue='false'>4/28/2010 12:00:00 AM</Value></Geq>

                                <Eq><FieldRef Name='pto_name' /><Value Type='Text' >International</Value></Eq>

                </And>

</Where>

query.ViewFields = string.Concat(

                                    "<FieldRef Name= ‘fieldId'/>",

                                   "<FieldRef Name= 'Fieldname' />",

                                   "<FieldRef Name= ‘pto_name' />",

                                   "<FieldRef Name= ‘rt_start'  />",

"<FieldRef Name= ‘rt_end '  />",

@bhi