Depends on your jurisdiction but "truancy" has been expanded to encompass just about everything nowadays.
To quote a Chicago public school official (who thought her mic was off) "We have to have the [butts] in the seats" ... "every single day, we can't afford to have absences, we need that money" Funny coming from a woman whose salary is $350,000 a year plus benefits and a boatload of days offs a year.
Schools were getting insane about it 3-4 years ago. My first born was a straight A student (as were all my children) and we don't vacation during peak season. Doing the responsible thing we planned ahead and asked for her assignments as we normally would do. 'Oh no, you can't have them'.... 'you can't do that'...
Pathetic. That was the straw that broke the camels back, the principle was begging us to bring them back after we withdrew them. Sorry, not sorry.
Public schools are a joke, between not being able to take your children on a vacation anymore to idiotic zero tolerance policies, don't even get me started on common core, they do more harm than good at this point, it's no wonder home schooling has quadrupled in the past 5 years.
Schools get paid by the 'rear ends' in the seats each day. If a child misses 5 days of school, the school misses 5 payments. They (the administrators at least) want their $$$, they could careless about anything else, my experience(s) and open mics prove it.