This is the 317th most frequent Hungarian word.
napja
"Napja" means "its day" or "the day of" in English, often used to denote a specific day's association with something or someone.
The word 'napja' in this sentence refers to someone's day, specifically spiritual or figurative ownership of a day.
Ma van a legboldogabb napja.
Today is his/her happiest day.
In this context, 'napja' signifies an individual's personal experience or time during a day.
A háború kezdete óta nincs nyugodt napja.
Since the war began, he/she hasn't had a peaceful day.
Here, 'napja' is used to denote a specific commemorative day belonging to an event or individual.