diff --git a/addons/auction/auction.py b/addons/auction/auction.py
index 176ac3039bb..1acc13f5b59 100644
--- a/addons/auction/auction.py
+++ b/addons/auction/auction.py
@@ -999,7 +999,7 @@ class report_seller_auction(osv.osv):
                 select
                     adl.id as auction,
                     min(al.id) as id,
-                    adl.auction1 as date,
+                    to_char(adl.auction1, 'YYYY-MM-DD') as date,
                     ad.partner_id as seller,
                     count(al.id) as "object_number",
                     SUM(al.obj_price) as "total_price",
@@ -1037,7 +1037,7 @@ class report_seller_auction2(osv.osv):
         cr.execute('''create or replace view report_seller_auction2  as
             (select
                 min(al.id) as id,
-                adl.auction1 as date,
+                to_char(adl.auction1, 'YYYY-MM-DD') as date,
                 adl.id as auction,
                 ad.partner_id as seller,
                 sum(al.obj_price) as "sum_adj",
@@ -1073,7 +1073,7 @@ class report_auction_view2(osv.osv):
         cr.execute('''create or replace view report_auction_view2 as (
             select
                 ad.id as id,
-                ad.auction1 as date,
+                to_char(ad.auction1, 'YYYY-MM-DD') as date,
                 ad.id as "auction",
                 count(al.id) as "obj_number",
                 SUM(al.obj_price) as "sum_adj",