Yesterday was an unlucky day for me.

来日诰日是我倒霉的一天。

What an unlucky day I had last week!

上周我倒霉的一天了！

Friday has long been regarded as an unlucky day.

星期五多年来一直被认为是不吉利的日子.

Friday the thirteenth is believed to be an unlucky day.

一般人相信十三日星期五是不吉利的日子.