not be somebody's day

be not (one's) day

To be a day that has been particularly stressful, difficult, disappointing, or filled with unfortunate events. I can't believe I got locked out of the apartment. This isn't my day. I'm sorry, sweetie, I know you studied hard for that test. It just wasn't your day.
See also: not
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.

not be somebody’s ˈday

(spoken) be a day when a lot of things go wrong for somebody: First I tore my jacket, then my car broke down. This is definitely not my day!
See also: not
Farlex Partner Idioms Dictionary © Farlex 2017
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