I added on the home page dashlet "My meetings".
This module has a filter field "Start date".
I set any value for this field, and when I save the data, the value of this field is lost, and in the field "date entered" no.

In the file /include/dashlet/DashletGeneric.php, line 427

PHP Code:
if ($ widgetDef ['type'] == 'datetime' | | $ widgetDef ['type'] == 'date') (
    ....
) 
In this line, check the field type "date" ('datetime OR date). The field "Start date" has type 'datetimecombo' and it does not pass on their type.

Thanks.
Sorry for my english