dayOfTheYear function

int dayOfTheYear(
  1. DateTime date
)

Implementation

int dayOfTheYear(DateTime date) {
  int days = 0;
  for (int i = 1; i < date.month; i++) {
    days += daysInMonth(i, date.year);
  }
  days += date.day;
  return days;

  // example:
  // dayOfTheYear(DateTime(2020, 2, 28)) => 60
}