I'm having a really bad day.

我今天倒霉透了。

《牛津词典》

It had been a really bad day.

那真是很坏的一天。

youdao

I still have those gifts, and when I've had a really bad day.

我依然保存着那些礼物，当我遇到一个特别糟糕的日子里，通读它们。

youdao

Each is considered "Crit-One-R" -- meaning a cable and its twin would have to both fail to make for a really Bad Day.

CNN: Challenger explosion

"We played the world champions and...you feel like you are not too far away and you are not turning up thinking 'let's hope we have a really good day and they have a really bad day and we've got the chance of causing a major upset', " Gatland said.

BBC: Wales fail to buck losing trend against Boks

Baseball players deal with temperature variations between April and October, but any really bad weather day means a postponement.

FORBES: The NFL's Coldest Games