code: public static boolean isSameDay(Calendar dayOne, Calendar dayTwo) {
          return dayOne.get(Calendar.YEAR) == dayTwo.get(Calendar.YEAR) && dayOne.get(Calendar.DAY_OF_YEAR) == dayTwo.get(Calendar.DAY_OF_YEAR);
      }
docs: Checks if two times are on the same day.
  @param dayOne The first day.
  @param dayTwo The second day.
  @return Whether the times are on the same day.