birthdate的复数形式怎么写？

n.出生日期...

My birthdate is January 12,1974.1974年元月12日.You cannot be over 18 with this birthdate.根据输入的出生日期,您不可能超过18岁.She pleaded guilty and gave a phony name and birthdate — showing her to be 18.于是这名女孩被投入代顿市的州立监狱服刑6个月.到目前为止,她已坐牢4个月....

birthdate的音标：birthdate的英式发音音标为：['bɜ:θdeɪt]birthdate的美式发音音标为：['bɜθdeɪt]...