This is the 7894th most frequent Japanese word.
土曜
Saturday.
In this sentence, '土曜日' is used to express the recurring day of the week on which the activity takes place.
毎週土曜日にはサッカーをします。
I play soccer every Saturday.
Here, '土曜日' specifies the exact day on which the action occurred.
土曜日の午後に映画を見に行きました。
I went to watch a movie on Saturday afternoon.
In this context, '土曜日' is used to refer to a specific upcoming day within the next week.