[FIX] account: use datetime object

Unlike the name suggested, today is expected to be a datetime, not a date object

Fixes odoo/odoo#27445

addons/account/models/account_journal_dashboard.py

@@ -91,7 +91,7 @@ class account_journal(models.Model):
     @api.multi
     def get_bar_graph_datas(self):
         data = []
-        today = fields.Date.context_today(self)
+        today = fields.Datetime.now(self)
         data.append({'label': _('Past'), 'value':0.0, 'type': 'past'})
         day_of_week = int(format_datetime(today, 'e', locale=self._context.get('lang') or 'en_US'))
         first_day_of_week = today + timedelta(days=-day_of_week+1)