“今天是什么日子”用英语怎么说

Which day is it today?
教授从办公室回家,看见桌上有很大的一束花,他就问夫人：“今天是什么日子?” “啊?你忘了吗?今天是你的结婚纪念啊.” 教授听了,高兴地笑了：“谢谢你告诉我这件事!你的结婚日那天,我也买一个大花束祝贺你.”
The professor comes home from his office,sees a huge bouquet of flowers on the table,and asks his wife:“Which day is it today?” “What?You forgot it?Today’s your wedding anniversary.” When the professor hears that,he smiles happily:“Thanks for telling me that!On your wedding anniversary,I will congratulate you with a huge bouquet of flowers,too.”