Some education institutions use two week schedule system. This class calculates is given date the first or second studying week.
We pass time in Unix-epoch seconds in the constructor.
use StudyingWeek\StudyingWeek;
$week = new StudyingWeek(strtotime('2020-07-11'));
$isEven = $week->isEven(); // or $week->isOdd();Calculation algorithm may vary depend on country/institution. Feel free to fork and modify it.