十三日用英文怎么说

十三日用英语说作"Thirteenth".

"Thirteenth" 的来源是英语中的"thirteen"（十三）与后缀"th"（第十三）组合而成。

例句：

The thirteenth of the month is coming up. (本月十三日即将到来。)
He was born on the thirteenth of July. (他生日是七月十三日。)
The thirteenth chapter of the book is interesting. (这本书第十三章很有趣。)