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Even though _yesterday_ is not an adverb, we say:

> I played golf yesterday.

only because the preposition, _on_ , is dropped before _yesterday_. In that
_on yesterday_ becomes a prepositional phrase that modifies _played_ :

> I played golf (on) yesterday.

That preposition dropping is a rule. What about Japanese sentences like:

> 昨日、ゴルフやった。

Grammatically, is there really a particle after _昨日_ such as:

> 昨日 (では) ゴルフやった。  
>  昨日 (に) ゴルフやった。

In speaking, you pause instead of saying the particle, but in official
writing, are those possible particles after _昨日_ written (instead of a comma)?

Of course, this is not limited to just _昨日_ such as:

> 毎日、日本語を練習しています.  
>  先週月曜日、出張した。  
>  など...

In English legal contracts, every last preposition and comma are triple
checked because they can make such a huge difference in any sort of dispute.

Now, Japanese commas seem to be void of specificity and thus open to
"interpretation" by the counterparties / judge / arbiter, right? With big $ on
the line, the counterparties must specify **exactly** what they are agreeing
to, and you can't do that with commas???
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2016-02-24T13:18:25.147
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2020-12-30T10:04:26.657
2016-02-24T13:24:19.977
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question
particles time
For time adverbs, are particles instead of commas used in official (legal) writing?
No, you won't see any case particle after following words, official or not, as
long as they're used to indicate the time when the sentence takes place
_on/in_ , because they are completely adverbial in this usage.

  * 昨日, 今日, 明日 etc.
  * 先週, 今週, 来週 etc.
  * 先月, 今月, 来月 etc.
  * 前期, 今期, 来期 etc.
  * 去年, 今年, 来年 etc.
  * 今朝, 明朝, 昨晩, 今晩, 今夜 etc.
  * 毎日, 毎週, 毎月, 毎年 etc.

> 6時に荷物が届きそうだ。  
>  夕方（に）荷物が届きそうだ。  
>  今晩（× に）荷物が届きそうだ。  
>  今日（× に）荷物が届きそうだ。  
>  今週（× に）荷物が届きそうだ。

Of course, if you use those words in other ways, you must put right particles.

> 今日 **で** 仕事が終わる。 ( _by_ today)  
>  今日 **にも** 荷物が届きそうだ。 (any day now)  
>  今日（ **も** ／ **は** ）荷物が届きそうだ。 (particles other than case aren't affected)
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2016-02-24T19:47:45.477
32444
2020-12-30T10:04:26.657
2020-12-30T10:04:26.657
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answer