On Tuesday night, I went to the see doctor.

On Wednesday night, I visited my uncle's farm.

Thursday night, I stayed at home.

I saw some people using this structure on Google Books. However, I'm still not sure if it's grammatical/idiomatic to omit the "on."

  • 1
    The preposition on is optional in your contexts - as it would be if you hadn't "fronted" the adverbial clause. I went out Friday night is idiomatically fine in normal speech (but on would normally be included in more "formal" contexts). – FumbleFingers Reinstate Monica Jun 13 '18 at 13:18

In the language rules of English, "night" is a noun.

"Thursday night" is still a noun.

Nouns can't explain the actions of verbs, but adverbs can.

What you need to make it an adverb is to add the preposition "on".

I stayed at home. When? On Thursday night.

You can't normally answer that question with just "Thursday night".

So I'd assume it to be grammatically incorrect.

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  • … except that just Thursday night would be the most natural thing to say in conversation, much the same as last night I stayed home or yesterday morning I stayed home. – choster Jun 13 '18 at 20:10

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