noun
yesterday and today
Literal temporal meaning, often used when contrasting the two days or referring to a very recent past.
昨日今日と雨が続いている。
It has been raining yesterday and today.
昨日今日の出来事ではない。
It's not something that happened just yesterday or today.
noun
only recently; just recently; only yesterday
Figurative use emphasizing that something happened very recently, often with a nuance of surprise or that it's still fresh.
彼が引っ越してきたのは昨日今日のことだ。
He moved here only recently.
昨日今日始めたばかりの趣味です。
It's a hobby I just started recently.