U cn achieve this using properties get set method.
Declare get set method in form2 like
DateTime _date;
public int PickDatetime
{
get
{
return this._date;
}
set
{
this._date = value;
}
}
Then on form2 load event u cn code
datetimepicker1.value=_date;
And on form1 while calling form2 put following code
form2 obj=new form2();
obj.PickDatetime =datetimepicker1.value;
obj.show();
hope this will help u
plz vote and accept ans if it helps.
:)