dayIndexOfWeek method

int dayIndexOfWeek([
  1. int firstWeekDay = 1
])

获取当前日期处在当前周的第几天

firstWeekDay - 设置每周起始日, assert(firstWeekDay > 0 && firstWeekDay < 7)

Implementation

int dayIndexOfWeek([int firstWeekDay = 1]) {
  assert(firstWeekDay > 0 && firstWeekDay < 7);
  int sub = this - this.firstDayInWeek(firstWeekDay);
  return (sub / 86400000).ceil() + 1;
}