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本篇文章給大家分享的是有關(guān)利用java如何實(shí)現(xiàn)判斷日期，小編覺得挺實(shí)用的，因此分享給大家學(xué)習(xí)，希望大家閱讀完這篇文章后可以有所收獲，話不多說，跟著小編一起來看看吧。

實(shí)例如下：

一 json optString 解析的TimesTamp string

二 long dateSec = (long) (Double.valueOf(timestamp) * 1000);

三 Date date=new Date(dateSec);

四 getTimestampString(date);

public static String getTimestampString(Date paramDate) {
    String str = null;
    long l = paramDate.getTime();
    Calendar localCalendar = GregorianCalendar.getInstance();
    localCalendar.setTime(paramDate);
    int year = localCalendar.get(Calendar.YEAR);
    if(! isSameYear(year)){ //去年，直接返回
      String paramDate2str = new SimpleDateFormat("yyyy MM dd", Locale.CHINA).format(paramDate);
      return paramDate2str;
    }


    if (isSameDay(l)) {
      int i = localCalendar.get(Calendar.HOUR_OF_DAY);
      if (i > 17) {
        str = "晚上 HH:mm";//HH表示24小時(shí),hh表示12小時(shí)進(jìn)制，
      } else if ((i >= 0) && (i <= 6)) {
        str = "凌晨 HH:mm";
      } else if ((i > 11) && (i <= 17)) {
        str = "下午 HH:mm";
      } else {
        str = "上午 HH:mm";
      }
    } else if (isYesterday(l)) {
      str = "昨天 HH:mm";
    } else if (isBeforeYesterday(l)) {
      str = "前天 HH:mm";
    } else {
      str = "M月d日 HH:mm";
    }
    String paramDate2str = new SimpleDateFormat(str, Locale.CHINA).format(paramDate);
    return paramDate2str;
  }

。。。

//  獲取 今天開始結(jié)束 時(shí)間

 public static TimeInfo getTodayStartAndEndTime() {

    Calendar localCalendar1 = Calendar.getInstance();
    localCalendar1.set(Calendar.HOUR_OF_DAY, 0);
    localCalendar1.set(Calendar.MINUTE, 0);
    localCalendar1.set(Calendar.SECOND, 0);
    localCalendar1.set(Calendar.MILLISECOND, 0);
    Date localDate1 = localCalendar1.getTime();

    long l1 = localDate1.getTime();




    Calendar localCalendar2 = Calendar.getInstance();
    localCalendar2.set(Calendar.HOUR_OF_DAY, 23);
    localCalendar2.set(Calendar.MINUTE, 59);
    localCalendar2.set(Calendar.SECOND, 59);
    localCalendar2.set(Calendar.MILLISECOND, 999);
    Date localDate2 = localCalendar2.getTime();

    long l2 = localDate2.getTime();




    TimeInfo localTimeInfo = new TimeInfo();
    localTimeInfo.setStartTime(l1);
    localTimeInfo.setEndTime(l2);
    return localTimeInfo;

  }




//  獲取 昨天開始結(jié)束 時(shí)間


  public static TimeInfo getYesterdayStartAndEndTime() {
    Calendar localCalendar1 = Calendar.getInstance();
    localCalendar1.add(Calendar.DAY_OF_MONTH, -1);//5
    localCalendar1.set(Calendar.HOUR_OF_DAY, 0);//11
    localCalendar1.set(Calendar.MINUTE, 0);//12
    localCalendar1.set(Calendar.SECOND, 0);//13
    localCalendar1.set(Calendar.MILLISECOND, 0);//Calendar.MILLISECOND
    Date localDate1 = localCalendar1.getTime();
    long l1 = localDate1.getTime();


    Calendar localCalendar2 = Calendar.getInstance();
    localCalendar2.add(Calendar.DAY_OF_MONTH, -1);//5
    localCalendar2.set(Calendar.HOUR_OF_DAY, 23);//11
    localCalendar2.set(Calendar.MINUTE, 59);//12
    localCalendar2.set(Calendar.SECOND, 59);//13
    localCalendar2.set(Calendar.MILLISECOND, 999);//Calendar.MILLISECOND
    Date localDate2 = localCalendar2.getTime();
    long l2 = localDate2.getTime();


    TimeInfo localTimeInfo = new TimeInfo();
    localTimeInfo.setStartTime(l1);
    localTimeInfo.setEndTime(l2);
    return localTimeInfo;
  }





//  獲取 前天開始結(jié)束 時(shí)間


  public static TimeInfo getBeforeYesterdayStartAndEndTime() {
    Calendar localCalendar1 = Calendar.getInstance();
    localCalendar1.add(Calendar.DAY_OF_MONTH, -2);
    localCalendar1.set(Calendar.HOUR_OF_DAY, 0);
    localCalendar1.set(Calendar.MINUTE, 0);
    localCalendar1.set(Calendar.SECOND, 0);
    localCalendar1.set(Calendar.MILLISECOND, 0);
    Date localDate1 = localCalendar1.getTime();
    long l1 = localDate1.getTime();


    Calendar localCalendar2 = Calendar.getInstance();
    localCalendar2.add(Calendar.DAY_OF_MONTH, -2);
    localCalendar2.set(Calendar.HOUR_OF_DAY, 23);
    localCalendar2.set(Calendar.MINUTE, 59);
    localCalendar2.set(Calendar.SECOND, 59);
    localCalendar2.set(Calendar.MILLISECOND, 999);
    Date localDate2 = localCalendar2.getTime();
    long l2 = localDate2.getTime();
    TimeInfo localTimeInfo = new TimeInfo();
    localTimeInfo.setStartTime(l1);
    localTimeInfo.setEndTime(l2);
    return localTimeInfo;
  }





  private static boolean isSameDay(long paramLong) {
    TimeInfo localTimeInfo = getTodayStartAndEndTime();
    return (paramLong > localTimeInfo.getStartTime()) && (paramLong < localTimeInfo.getEndTime());
  }


  private static boolean isYesterday(long paramLong) {
    TimeInfo localTimeInfo = getYesterdayStartAndEndTime();
    return (paramLong > localTimeInfo.getStartTime()) && (paramLong < localTimeInfo.getEndTime());
  }





  private static boolean isBeforeYesterday(long paramLong) {
    TimeInfo localTimeInfo = getBeforeYesterdayStartAndEndTime();
    return (paramLong > localTimeInfo.getStartTime()) && (paramLong < localTimeInfo.getEndTime());
  }








  public static boolean isSameYear(int year) {
    Calendar cal = Calendar.getInstance();
    int CurYear = cal.get(Calendar.YEAR);
//    Log.e("","CurYear="+CurYear);//2015
    return CurYear==year;
  }


。。。。。。

public class TimeInfo {
  private long startTime;
  private long endTime;


  public long getStartTime() {
    return this.startTime;
  }


  public void setStartTime(long paramLong) {
    this.startTime = paramLong;
  }


  public long getEndTime() {
    return this.endTime;
  }


  public void setEndTime(long paramLong) {
    this.endTime = paramLong;
  }
}

當(dāng)前題目：利用java如何實(shí)現(xiàn)判斷日期-創(chuàng)新互聯(lián)
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