Date field is saved as DATETIME

We cannot use Views filtering by Date term_field because date fields are saved as DATETIME:

mysql> describe term_fields_term;
+-------+------------------+------+-----+---------+-------+
| Field | Type             | Null | Key | Default | Extra |
+-------+------------------+------+-----+---------+-------+
| tid   | int(10) unsigned | NO   | PRI | NULL    |       | 
| test  | datetime         | YES  |     | NULL    |       | 
+-------+------------------+------+-----+---------+-------+

Views generate next code when we try to filter results by date term_field:

SELECT term_data.tid AS tid, term_fields_term.test AS term_fields_term_test, term_fields_term.tid AS term_fields_term_tid FROM term_data term_data  
LEFT JOIN term_fields_term term_fields_term ON term_data.tid = term_fields_term.tid 
WHERE (term_fields_term.test >= ***CURRENT_TIME***-5270400) AND (term_fields_term.test <= ***CURRENT_TIME***+5097600)

MySQL cannot compare DATETIME field with Unix timestamp. I suppose that date should be saved in INT(11) or at least views date handler should be overloaded to convert datetime fields to Unix timestamp.

It seems that support for different date formats is planned (function term_fields_format_date) but not 100% implemented yet.

Both latest stable and dev versions are affected.