Javaは日付が今日かどうかを判断します

public static boolean isToday(String str, String formatStr) throws Exception{
    SimpleDateFormat format = new SimpleDateFormat(formatStr);
    Date date = null;
    try {
        date = format.parse(str);
    } catch (ParseException e) {
        logger.error("解析日期错误", e);
    }
    Calendar c1 = Calendar.getInstance();              
    c1.setTime(date);                                 
    int year1 = c1.get(Calendar.YEAR);
    int month1 = c1.get(Calendar.MONTH)+1;
    int day1 = c1.get(Calendar.DAY_OF_MONTH);     
    Calendar c2 = Calendar.getInstance(); 
    c2.setTime(new Date());
    int year2 = c2.get(Calendar.YEAR);
    int month2 = c2.get(Calendar.MONTH)+1;
    int day2 = c2.get(Calendar.DAY_OF_MONTH);   
    if(year1 == year2 && month1 == month2 && day1 == day2){
        return true;
    }
    return false;   
}