Definition
Experiencing a day filled with difficulties, misfortune, or unpleasant events.
运气不佳，于事不顺
It's really not my day; the alarm didn't go off this morning, and I was late for work.
今天真的不是我的日子；早上闹钟没响，我上班迟到了。
It wasn't her day; first, her phone fell into the water, and then she missed an important meeting.
今天不是她的日子；首先，她的手机掉进了水里，然后她错过了一个重要的会议。
I seem to be having an unlucky day; I stepped in dog poop this morning, and then my report was rejected this afternoon.
我似乎今天运气不好；早上踩到了狗屎，然后下午我的报告被拒绝了。