sqlException: The conversion of a datetime2 data type to a datetime data type resulted in an out-of-range value.

我的代码是这样的：

using (var contxt = new realtydbEntities())
        {
            var status = GetStatus();

            var repIssue = new RepairIssue()
            {
                CreaterId = AuthorId,RepairItemDesc = this.txtDescription.Text,CreateDate = DateTime.Now,//here's the problem
                RepairIssueStatu = status
            };

            contxt.AddObject("RepairIssues",repIssue);
            contxt.SaveChanges();
        }

CreateDate属性映射到类型为smalldatetime的列.

如何让这段代码运行？