diff --git a/account_asset_management/models/account_asset.py b/account_asset_management/models/account_asset.py
index 45345d285..37fc0ea68 100644
--- a/account_asset_management/models/account_asset.py
+++ b/account_asset_management/models/account_asset.py
@@ -626,11 +626,11 @@ class AccountAsset(models.Model):
                         duration = (fy_date_stop - fy_date_start).days + 1
                     else:
                         duration = (
-                            datetime(year, 12, 31) - fy_date_start).days + 1
+                            datetime(year, 12, 31).date() - fy_date_start).days + 1
                     factor = float(duration) / cy_days
                 elif i == cnt - 1:  # last year
                     duration = (
-                        fy_date_stop - datetime(year, 1, 1)).days + 1
+                        fy_date_stop - datetime(year, 1, 1).date()).days + 1
                     factor += float(duration) / cy_days
                 else:
                     factor += 1.0