Ruby on Rails中的SQL错误：“（完整）年份必须介于-4713和+9999之间，而不是0”

Question

我在Ruby中使用以下查询：

mcuglist = Balsiebeltogenevaprodmapping.find_by_sql ["select * from master_cug_list where customer_ref = ? and product_seq = ? and end_date = ? and line_seq is null order by directory_number",bseq_11.customer_ref,bseq_11.product_seq,(accdtlmap.start_dat.to_date + 9).strftime('%Y-%m-%d')]

它给了我标题中给出的错误：(full) year must be between -4713 and +9999, and not be 0。

如何了解如何将date传递给find_by_sql query？