[FIX] base: use datetime instead of date

The variable `date` is compared to the field `name` in the selection
query. `name` is filled in with datetime data. In particular, in the
module currency_rate_live, datetime.now() is used in the name. It is
necessary to make an appropriate comparison to make sure we select the
updated rate right away.

openerp/addons/base/res/res_currency.py

@@ -20,7 +20,7 @@ class res_currency(osv.osv):
             context = {}
         res = {}
 
-        date = context.get('date') or time.strftime('%Y-%m-%d')
+        date = context.get('date') or fields2.Datetime.now()
         company_id = context.get('company_id') or self.pool['res.users']._get_company(cr, uid, context=context)
         for id in ids:
             cr.execute("""SELECT rate FROM res_currency_rate