temporaty disable auto_now and auto_now_add for overwrite...

gistfile1.py

                for field in new_entry._meta.local_fields:
                    if field.name == "lastupdatetime":
                        field.auto_now = False
                    elif field.name == "createtime":
                        field.auto_now_add = False

                new_entry.createtime = date
                new_entry.lastupdatetime = date
                new_entry.save()

                for field in new_entry._meta.local_fields:
                    if field.name == "lastupdatetime":
                        field.auto_now = True
                    elif field.name == "createtime":
                        field.auto_now_add = True