JAVAでDate時間を取得するための様々な方法のまとめ

public class DateUtils {

  /**
   *      
   *     :1438692801766
   */
  @Test
  public void getTimeStamp() {
    Date date = new Date();
    long times = date.getTime();
    System.out.println(times);

    //     ：
    new Date().getTime();
  }

  /**
   *         
   *     ：2015-08-04 20:55:35
   */
  @Test
  public void getFormatDate(){
    Date date = new Date();
    long times = date.getTime();//   
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String dateString = formatter.format(date);
    System.out.println(dateString);
  }

  /**
   *            
   *   ：Tue Oct 07 12:04:36 CST 2014
   */
  @Test
  public void timestampToDate(){
    long times = 1412654676572L;
    Date date = new Date(times);
    System.out.println(date);
  }
}

package com.qunar.date;

import java.text.ParseException;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.*;

/**
 * Created by liugen.xu on 2015/8/4.
 */
public class DateGenerate {
  /**
   *       
   *
   * @return        yyyy-MM-dd HH:mm:ss
   */
  public static Date getNowDate() {
    Date currentTime = new Date();
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String dateString = formatter.format(currentTime);
    ParsePosition pos = new ParsePosition(8);
    Date currentTime_2 = formatter.parse(dateString, pos);
    return currentTime_2;
  }

  /**
   *       
   *
   * @return        yyyy-MM-dd
   */
  public static Date getNowDateShort() {
    Date currentTime = new Date();
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
    String dateString = formatter.format(currentTime);
    ParsePosition pos = new ParsePosition(8);
    Date currentTime_2 = formatter.parse(dateString, pos);
    return currentTime_2;
  }

  /**
   *       
   *
   * @return        yyyy-MM-dd HH:mm:ss
   */
  public static String getStringDate() {
    Date currentTime = new Date();
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String dateString = formatter.format(currentTime);
    return dateString;
  }

  /**
   *       
   *
   * @return           yyyy-MM-dd
   */
  public static String getStringDateShort() {
    Date currentTime = new Date();
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
    String dateString = formatter.format(currentTime);
    return dateString;
  }

  /**
   *        : ;  HH:mm:ss
   *
   * @return
   */
  public static String getTimeShort() {
    SimpleDateFormat formatter = new SimpleDateFormat("HH:mm:ss");
    Date currentTime = new Date();
    String dateString = formatter.format(currentTime);
    return dateString;
  }

  /**
   *                yyyy-MM-dd HH:mm:ss
   *
   * @param strDate
   * @return
   */
  public static Date strToDateLong(String strDate) {
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    ParsePosition pos = new ParsePosition(0);
    Date strtodate = formatter.parse(strDate, pos);
    return strtodate;
  }

  /**
   *                yyyy-MM-dd HH:mm:ss
   *
   * @param dateDate
   * @return
   */
  public static String dateToStrLong(java.util.Date dateDate) {
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String dateString = formatter.format(dateDate);
    return dateString;
  }

  /**
   *                yyyy-MM-dd
   *
   * @param dateDate
   * @return
   */
  public static String dateToStr(java.util.Date dateDate) {
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
    String dateString = formatter.format(dateDate);
    return dateString;
  }

  /**
   *                yyyy-MM-dd
   *
   * @param strDate
   * @return
   */
  public static Date strToDate(String strDate) {
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
    ParsePosition pos = new ParsePosition(0);
    Date strtodate = formatter.parse(strDate, pos);
    return strtodate;
  }

  /**
   *       
   *
   * @return
   */
  public static Date getNow() {
    Date currentTime = new Date();
    return currentTime;
  }

  /**
   *            
   *
   * @param day
   * @return
   */
  public static Date getLastDate(long day) {
    Date date = new Date();
    long date_3_hm = date.getTime() - 3600000 * 34 * day;
    Date date_3_hm_date = new Date(date_3_hm);
    return date_3_hm_date;
  }

  /**
   *       
   *
   * @return     yyyyMMdd HHmmss
   */
  public static String getStringToday() {
    Date currentTime = new Date();
    SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMdd HHmmss");
    String dateString = formatter.format(currentTime);
    return dateString;
  }

  /**
   *       
   */
  public static String getHour() {
    Date currentTime = new Date();
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String dateString = formatter.format(currentTime);
    String hour;
    hour = dateString.substring(11, 13);
    return hour;
  }

  /**
   *       
   *
   * @return
   */
  public static String getTime() {
    Date currentTime = new Date();
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String dateString = formatter.format(currentTime);
    String min;
    min = dateString.substring(14, 16);
    return min;
  }

  /**
   *              ，             yyyyMMdd，    y    。
   *
   * @param sformat yyyyMMddhhmmss
   * @return
   */
  public static String getUserDate(String sformat) {
    Date currentTime = new Date();
    SimpleDateFormat formatter = new SimpleDateFormat(sformat);
    String dateString = formatter.format(currentTime);
    return dateString;
  }

  /**
   *           ,          "HH:MM"   ，        
   */
  public static String getTwoHour(String st1, String st2) {
    String[] kk = null;
    String[] jj = null;
    kk = st1.split(":");
    jj = st2.split(":");
    if (Integer.parseInt(kk[0]) < Integer.parseInt(jj[0]))
      return "0";
    else {
      double y = Double.parseDouble(kk[0]) + Double.parseDouble(kk[1]) / 60;
      double u = Double.parseDouble(jj[0]) + Double.parseDouble(jj[1]) / 60;
      if ((y - u) > 0)
        return y - u + "";
      else
        return "0";
    }
  }

  /**
   *             
   */
  public static String getTwoDay(String sj1, String sj2) {
    SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
    long day = 0;
    try {
      java.util.Date date = myFormatter.parse(sj1);
      java.util.Date mydate = myFormatter.parse(sj2);
      day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);
    } catch (Exception e) {
      return "";
    }
    return day + "";
  }

  /**
   *          ,  JJ    .
   */
  public static String getPreTime(String sj1, String jj) {
    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String mydate1 = "";
    try {
      Date date1 = format.parse(sj1);
      long Time = (date1.getTime() / 1000) + Integer.parseInt(jj) * 60;
      date1.setTime(Time * 1000);
      mydate1 = format.format(date1);
    } catch (Exception e) {
    }
    return mydate1;
  }

  /**
   *                 ,nowdate   ,delay         
   */
  public static String getNextDay(String nowdate, String delay) {
    try {
      SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
      String mdate = "";
      Date d = strToDate(nowdate);
      long myTime = (d.getTime() / 1000) + Integer.parseInt(delay) * 24 * 60 * 60;
      d.setTime(myTime * 1000);
      mdate = format.format(d);
      return mdate;
    } catch (Exception e) {
      return "";
    }
  }

  /**
   *       
   *
   * @param ddate
   * @return
   */
  public static boolean isLeapYear(String ddate) {

    /**
     *     ： 1. 400     ，  ： 2.   4        3.  4       100      
     * 3.  4      100       
     */
    Date d = strToDate(ddate);
    GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();
    gc.setTime(d);
    int year = gc.get(Calendar.YEAR);
    if ((year % 400) == 0)
      return true;
    else if ((year % 4) == 0) {
      if ((year % 100) == 0)
        return false;
      else
        return true;
    } else
      return false;
  }

  /**
   *          26 Apr 2006
   *
   * @param str
   * @return
   */
  public static String getEDate(String str) {
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
    ParsePosition pos = new ParsePosition(0);
    Date strtodate = formatter.parse(str, pos);
    String j = strtodate.toString();
    String[] k = j.split(" ");
    return k[2] + k[1].toUpperCase() + k[5].substring(2, 4);
  }

  /**
   *           
   *
   * @param dat
   * @return
   */
  public static String getEndDateOfMonth(String dat) {// yyyy-MM-dd
    String str = dat.substring(0, 8);
    String month = dat.substring(5, 7);
    int mon = Integer.parseInt(month);
    if (mon == 1 || mon == 3 || mon == 5 || mon == 7 || mon == 8 || mon == 10 || mon == 12) {
      str += "31";
    } else if (mon == 4 || mon == 6 || mon == 9 || mon == 11) {
      str += "30";
    } else {
      if (isLeapYear(dat)) {
        str += "29";
      } else {
        str += "28";
      }
    }
    return str;
  }

  /**
   *              
   *
   * @param date1
   * @param date2
   * @return
   */
  public static boolean isSameWeekDates(Date date1, Date date2) {
    Calendar cal1 = Calendar.getInstance();
    Calendar cal2 = Calendar.getInstance();
    cal1.setTime(date1);
    cal2.setTime(date2);
    int subYear = cal1.get(Calendar.YEAR) - cal2.get(Calendar.YEAR);
    if (0 == subYear) {
      if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2.get(Calendar.WEEK_OF_YEAR))
        return true;
    } else if (1 == subYear && 11 == cal2.get(Calendar.MONTH)) {
      //   12                             
      if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2.get(Calendar.WEEK_OF_YEAR))
        return true;
    } else if (-1 == subYear && 11 == cal1.get(Calendar.MONTH)) {
      if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2.get(Calendar.WEEK_OF_YEAR))
        return true;
    }
    return false;
  }

  /**
   *      ,                
   *
   * @return
   */
  public static String getSeqWeek() {
    Calendar c = Calendar.getInstance(Locale.CHINA);
    String week = Integer.toString(c.get(Calendar.WEEK_OF_YEAR));
    if (week.length() == 1)
      week = "0" + week;
    String year = Integer.toString(c.get(Calendar.YEAR));
    return year + week;
  }

  /**
   *                  ，    2002 2 3           
   *
   * @param sdate
   * @param num
   * @return
   */
  public static String getWeek(String sdate, String num) {
    //       
    Date dd = DateGenerate.strToDate(sdate);
    Calendar c = Calendar.getInstance();
    c.setTime(dd);
    if (num.equals("1")) //           
      c.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
    else if (num.equals("2")) //           
      c.set(Calendar.DAY_OF_WEEK, Calendar.TUESDAY);
    else if (num.equals("3")) //           
      c.set(Calendar.DAY_OF_WEEK, Calendar.WEDNESDAY);
    else if (num.equals("4")) //           
      c.set(Calendar.DAY_OF_WEEK, Calendar.THURSDAY);
    else if (num.equals("5")) //           
      c.set(Calendar.DAY_OF_WEEK, Calendar.FRIDAY);
    else if (num.equals("6")) //           
      c.set(Calendar.DAY_OF_WEEK, Calendar.SATURDAY);
    else if (num.equals("0")) //           
      c.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
    return new SimpleDateFormat("yyyy-MM-dd").format(c.getTime());
  }

  /**
   *       ，          
   *
   * @param sdate
   * @return
   */
  public static String getWeek(String sdate) {
    //       
    Date date = DateGenerate.strToDate(sdate);
    Calendar c = Calendar.getInstance();
    c.setTime(date);
    // int hour=c.get(Calendar.DAY_OF_WEEK);
    // hour         ，    1~7
    // 1=    7=   ，    
    return new SimpleDateFormat("EEEE").format(c.getTime());
  }

  public static String getWeekStr(String sdate) {
    String str = "";
    str = DateGenerate.getWeek(sdate);
    if ("1".equals(str)) {
      str = "   ";
    } else if ("2".equals(str)) {
      str = "   ";
    } else if ("3".equals(str)) {
      str = "   ";
    } else if ("4".equals(str)) {
      str = "   ";
    } else if ("5".equals(str)) {
      str = "   ";
    } else if ("6".equals(str)) {
      str = "   ";
    } else if ("7".equals(str)) {
      str = "   ";
    }
    return str;
  }

  /**
   *          
   *
   * @param date1
   * @param date2
   * @return
   */
  public static long getDays(String date1, String date2) {
    if (date1 == null || date1.equals(""))
      return 0;
    if (date2 == null || date2.equals(""))
      return 0;
    //        
    SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
    java.util.Date date = null;
    java.util.Date mydate = null;
    try {
      date = myFormatter.parse(date1);
      mydate = myFormatter.parse(date2);
    } catch (Exception e) {
    }
    long day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);
    return day;
  }

  /**
   *         ，                                                       
   *                    
   *
   * @param sdate
   * @return
   */
  public static String getNowMonth(String sdate) {
    //           
    sdate = sdate.substring(0, 8) + "01";

    //       1     
    Date date = DateGenerate.strToDate(sdate);
    Calendar c = Calendar.getInstance();
    c.setTime(date);
    int u = c.get(Calendar.DAY_OF_WEEK);
    String newday = DateGenerate.getNextDay(sdate, (1 - u) + "");
    return newday;
  }

  /**
   *              yyyymmddhhmmss+k    
   *
   * @param k          ，     
   */

  public static String getNo(int k) {

    return getUserDate("yyyyMMddhhmmss") + getRandom(k);
  }

  /**
   *        
   *
   * @param i
   * @return
   */
  public static String getRandom(int i) {
    Random jjj = new Random();
    // int suiJiShu = jjj.nextInt(9);
    if (i == 0)
      return "";
    String jj = "";
    for (int k = 0; k < i; k++) {
      jj = jj + jjj.nextInt(9);
    }
    return jj;
  }

  /**
   */
  public static boolean RightDate(String date) {

    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
    ;
    if (date == null)
      return false;
    if (date.length() > 10) {
      sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
    } else {
      sdf = new SimpleDateFormat("yyyy-MM-dd");
    }
    try {
      sdf.parse(date);
    } catch (ParseException pe) {
      return false;
    }
    return true;
  }

  /**
   * ************************************************************************
   * //nd=1            //yf=1            //rq=1            //format        1
   *          2    -   // 3    /   4               // 5    .  
   * ************************************************************************
   */
  public static String getStringDateMonth(String sdate, String nd, String yf, String rq, String format) {
    Date currentTime = new Date();
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
    String dateString = formatter.format(currentTime);
    String s_nd = dateString.substring(0, 4); //   
    String s_yf = dateString.substring(5, 7); //   
    String s_rq = dateString.substring(8, 10); //   
    String sreturn = "";
    roc.util.MyChar mc = new roc.util.MyChar();
    if (sdate == null || sdate.equals("") || !mc.Isdate(sdate)) { //       
      if (nd.equals("1")) {
        sreturn = s_nd;
        //      
        if (format.equals("1"))
          sreturn = sreturn + " ";
        else if (format.equals("2"))
          sreturn = sreturn + "-";
        else if (format.equals("3"))
          sreturn = sreturn + "/";
        else if (format.equals("5"))
          sreturn = sreturn + ".";
      }
      //     
      if (yf.equals("1")) {
        sreturn = sreturn + s_yf;
        if (format.equals("1"))
          sreturn = sreturn + " ";
        else if (format.equals("2"))
          sreturn = sreturn + "-";
        else if (format.equals("3"))
          sreturn = sreturn + "/";
        else if (format.equals("5"))
          sreturn = sreturn + ".";
      }
      //     
      if (rq.equals("1")) {
        sreturn = sreturn + s_rq;
        if (format.equals("1"))
          sreturn = sreturn + " ";
      }
    } else {
      //     ，          ，              
      sdate = roc.util.RocDate.getOKDate(sdate);
      s_nd = sdate.substring(0, 4); //   
      s_yf = sdate.substring(5, 7); //   
      s_rq = sdate.substring(8, 10); //   
      if (nd.equals("1")) {
        sreturn = s_nd;
        //      
        if (format.equals("1"))
          sreturn = sreturn + " ";
        else if (format.equals("2"))
          sreturn = sreturn + "-";
        else if (format.equals("3"))
          sreturn = sreturn + "/";
        else if (format.equals("5"))
          sreturn = sreturn + ".";
      }
      //     
      if (yf.equals("1")) {
        sreturn = sreturn + s_yf;
        if (format.equals("1"))
          sreturn = sreturn + " ";
        else if (format.equals("2"))
          sreturn = sreturn + "-";
        else if (format.equals("3"))
          sreturn = sreturn + "/";
        else if (format.equals("5"))
          sreturn = sreturn + ".";
      }
      //     
      if (rq.equals("1")) {
        sreturn = sreturn + s_rq;
        if (format.equals("1"))
          sreturn = sreturn + " ";
      }
    }
    return sreturn;
  }

  public static String getNextMonthDay(String sdate, int m) {
    sdate = getOKDate(sdate);
    int year = Integer.parseInt(sdate.substring(0, 4));
    int month = Integer.parseInt(sdate.substring(5, 7));
    month = month + m;
    if (month < 0) {
      month = month + 12;
      year = year - 1;
    } else if (month > 12) {
      month = month - 12;
      year = year + 1;
    }
    String smonth = "";
    if (month < 10)
      smonth = "0" + month;
    else
      smonth = "" + month;
    return year + "-" + smonth + "-10";
  }

  public static String getOKDate(String sdate) {
    if (sdate == null || sdate.equals(""))
      return getStringDateShort();

    if (!VeStr.Isdate(sdate)) {
      sdate = getStringDateShort();
    }
    //  “/”   “-”
    sdate = VeStr.Replace(sdate, "/", "-");
    //     8   ，      
    if (sdate.length() == 8)
      sdate = sdate.substring(0, 4) + "-" + sdate.substring(4, 6) + "-" + sdate.substring(6, 8);
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
    ParsePosition pos = new ParsePosition(0);
    Date strtodate = formatter.parse(sdate, pos);
    String dateString = formatter.format(strtodate);
    return dateString;
  }

  public static void main(String[] args) throws Exception {
    try {
      //System.out.print(Integer.valueOf(getTwoDay("2006-11-03 12:22:10", "2006-11-02 11:22:09")));
    } catch (Exception e) {
      throw new Exception();
    }
    //System.out.println("sss");
  }
}