java时间天数差-526互联

时间天数差

 private int diffInDays(Date star, Date endDay) {
    Date nextDay = star;
    int diffInDays = 1;
    while(nextDay.before(endDay)){//当明天不在结束时间之前是终止循环
      Calendar cld = Calendar.getInstance();
      cld.setTime(star);
      cld.add(Calendar.DATE, 1);
      star = cld.getTime();
      //获得下一天日期字符串
      nextDay = star;

      System.out.println("-----------"+nextDay);
      diffInDays++;
    }
    return diffInDays;
  }

list 中根据字符串查询对象
List<SigninRecord>

private SigninRecord search(Date signinTime, List<SigninRecord> list){
    SigninRecord results = new SigninRecord();
    DateFormat dateFormat = new SimpleDateFormat("yyy-MM-dd");

    Pattern pattern = Pattern.compile(dateFormat.format(signinTime));
    //不区分大小写
    // Pattern pattern = Pattern.compile(name,Pattern.CASE_INSENSITIVE);
    for(int i=0; i < list.size(); i++){
      Matcher matcher = pattern.matcher(list.get(i).getSigninTime().toString());
      if(matcher.find()){
        results = list.get(i);
      }
    }
    return results; 
}