94023
> 土曜日に予定がない

I don't think this に marks time because 予定がない is not something that happens.
My closest guess is that it denotes 評価.

[![img1](https://i.stack.imgur.com/Fo8hrm.jpg)](https://i.stack.imgur.com/Fo8hrm.jpg)
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2022-04-05T16:04:44.867
94012
2022-04-06T02:51:47.560
2022-04-05T16:12:58.193
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45630
question
grammar particle-に
Parsing 土曜日に予定がない
In this case「土曜日」(Saturday) is a time indication, so this usage of に is
temporal. The word「予定」means schedule or plan, but it's also used to mean
_plans_ (i.e. things to do). Your sentence therefore translates to:

> I have no plans on Saturday.
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2022-04-05T16:50:08.507
94013
2022-04-05T16:50:08.507
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94012
answer
ない being the negative form of the verb ある, your sentence has the same basic
structure as a sentence like this.

> 月曜日に試験がある。

This に clearly indicates a specific time when something happens. The
difference, of course, is that the subject in your sentence is not an action
or event, but a plan. But then again, this plan is one for **doing**
something. People will understand this 予定 as **する** こと and think of some
action or event when they hear someone say 予定がある or 予定がない. This must be making
に acceptable enough.

While totally acceptable in everyday conversation, the following polite
versions still don’t quite sound natural to me as standalone sentences.

> 土曜日に予定があります。
>
> 土曜日に予定がありません。

The following are totally unacceptable as スケジュール cannot be understood as the
same as すること.

> x 土曜日にスケジュールがあります。
>
> x 土曜日にスケジュールがありません。
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2022-04-06T02:51:47.560
94023
2022-04-06T02:51:47.560
43676
94012
answer