next day; the following day
Refers to the day after a reference point, typically in narrative or scheduling contexts. Can be used as a noun or adverbially without a particle.
The next day, he woke up early.
The meeting was postponed to the following day.
The day after the typhoon, the town was quiet.
It wasn't until the next day that he finally got in touch.
He took the exam and learned the results the next day.