Is date or calendar today's date

 
import java.util.Calendar;
import java.util.Date;

public class Main {
  public static boolean isToday(Date date) {
      return isSameDay(date, Calendar.getInstance().getTime());
  }
  public static boolean isToday(Calendar cal) {
      return isSameDay(cal, Calendar.getInstance());
  }
  public static boolean isSameDay(Date date1, Date date2) {
    if (date1 == null || date2 == null) {
      throw new IllegalArgumentException("The dates must not be null");
    }
    Calendar cal1 = Calendar.getInstance();
    cal1.setTime(date1);
    Calendar cal2 = Calendar.getInstance();
    cal2.setTime(date2);
    return isSameDay(cal1, cal2);
  }

  public static boolean isSameDay(Calendar cal1, Calendar cal2) {
    if (cal1 == null || cal2 == null) {
      throw new IllegalArgumentException("The dates must not be null");
    }
    return (cal1.get(Calendar.ERA) == cal2.get(Calendar.ERA)
        && cal1.get(Calendar.YEAR) == cal2.get(Calendar.YEAR) && cal1
          .get(Calendar.DAY_OF_YEAR) == cal2.get(Calendar.DAY_OF_YEAR));
  }

}