Birthdate is date property, not a datetime property, so fix it.
diff --git a/app/soc/modules/gci/logic/profile.py b/app/soc/modules/gci/logic/profile.py
index bd779bc..5da9f6b 100644
--- a/app/soc/modules/gci/logic/profile.py
+++ b/app/soc/modules/gci/logic/profile.py
@@ -49,7 +49,7 @@
 
 MELANGE_DELETED_USER_PHONE = '0000000000'
 
-MELANGE_DELETED_USER_BIRTH_DATE = datetime.datetime(1, 1, 1)
+MELANGE_DELETED_USER_BIRTH_DATE = datetime.date(1, 1, 1)
 
 
 def hasStudentFormsUploaded(student):