Day of week (& other date fields) recast as timestamps

Our client is uploading CSV data to CKAN which includes a column containing a day of the week.

Datapusher (via messytables) appears to decide that this is a date column and converts it to a timestamp. "Wednesday" appears to be interpreted as "This Wednesday" and is replaced by a timestamp in the form 2015-06-03T00:00:00 - which is useless to anyone reading the data, and frequently misleading.

Since the messytables code seemed to say that DateType includes format detection, I tried altering the configuration to use that instead of the DateUtilType that Datapusher uses normally, by adding:

``` python
TYPES = [messytables.StringType, messytables.DecimalType, messytables.IntegerType, messytables.DateType, messytables.BoolType]
TYPE_MAPPING = {
'String': 'text',
'Integer': 'numeric',
'Decimal': 'numeric',
'Date': 'timestamp'
}
```

into datapusher_settings.py. But it made no difference.

Is there any way of ensuring that dates get recognised as dates (and don't get given a spurious 00:00:00 timestamp), and days get left as days (strings)?