A weeknight is any evening or night from Monday to Friday — that is, a night that is followed by a working day or a school day.

A weeknight is any evening or night from Monday to Fridayweeknight是指星期一到星期五之間的任何一個晚上 — that is, a night that is followed by a working day or a school day也就是隔天要上班或上學的那個晚上。

The word carries a feeling with it, not just a fact about the calendar. When people say "it's a weeknight," they usually mean: I can't stay out late, I shouldn't drink much, I have to get up early.

The word carries a feeling with it, not just a fact about the calendar這個字帶著一種感覺，不只是日曆上的事實。When people say "it's a weeknight,"當人們說「it's a weeknight」的時候 they usually mean他們通常是在說：I can't stay out late, I shouldn't drink much, I have to get up early我不能玩到太晚、不該喝太多酒、明天要早起。

So you hear it most in sentences about what someone will NOT do: "I don't go out on weeknights," "Not on a weeknight." Notice the boundary is a bit soft.

So you hear it most in sentences about what someone will NOT do所以最常聽到它出現在說某人「不會」做什麼事的句子裡："I don't go out on weeknights,"「我平日晚上不出門」，"Not on a weeknight."「平日晚上不行」 Notice the boundary is a bit soft注意這個界線有點模糊。

Officially the weekend is Saturday and Sunday, so Friday night should be a weeknight — but almost nobody in daily speech calls Friday night a weeknight, because Friday night feels like the weekend has already started. Sunday night is the opposite case: it belongs to the weekend on paper, and some people would call it a weekend night, but many treat it as a weeknight because Monday morning is coming.

Officially the weekend is Saturday and Sunday正式來說週末是星期六和星期天，so Friday night should be a weeknight所以照理星期五晚上該算weeknight — but almost nobody in daily speech calls Friday night a weeknight但日常說話幾乎沒有人把星期五晚上叫做weeknight，because Friday night feels like the weekend has already started因為星期五晚上感覺週末已經開始了。Sunday night is the opposite case星期天晚上正好相反：it belongs to the weekend on paper名義上它屬於週末，and some people would call it a weekend night有些人會叫它weekend night，but many treat it as a weeknight because Monday morning is coming但很多人把它當成weeknight，因為星期一早上就要來了。

If you want to be exact, say "Monday to Thursday." The word is ordinary and informal — you can use it with anyone. There is a matching adjective use before a noun: "a weeknight dinner" (a quick, simple dinner), "weeknight TV." Shops, restaurants and gyms use it in notices: "Weeknights only." And note the plural-with-s form is how people talk about a habit: "on weeknights" means on weeknights in general, while "on a weeknight" points at one.

If you want to be exact如果想講得精確，say "Monday to Thursday."就說「Monday to Thursday」。The word is ordinary and informal這個字很普通、非正式 — you can use it with anyone跟誰講都可以。There is a matching adjective use before a noun它也能當形容詞放在名詞前："a weeknight dinner"「a weeknight dinner」（a quick, simple dinner一頓簡單快速的晚餐），"weeknight TV."「weeknight TV」（平日晚間電視節目） Shops, restaurants and gyms use it in notices商店、餐廳、健身房會在公告上用這個字："Weeknights only."「Weeknights only」（僅限平日晚上） And note the plural-with-s form is how people talk about a habit要注意加s的複數形式是用來講一種習慣："on weeknights" means on weeknights in general「on weeknights」是指平日晚上一般而言，while "on a weeknight" points at one而「on a weeknight」是指某一個平日晚上。