最近、忙しくて。昨日だって帰ったの12時すぎだったよ。
Please explain the use of の in the above sentence.
This の is a special noun used to form cleft sentences. English speakers use preparatory it for this type of sentence. Japanese speakers use の.
From this:
12時過ぎに帰った。
I got home past midnight.
We can form the following cleft sentence:
帰ったのは12時過ぎだった。
It was past midnight that I got home.
And we can drop は in casual speech:
帰ったの12時過ぎだった(よ)。
It was past midnight that I got home.