java 时间格式 收藏

java.util.*;
import java.text.*;
import java.util.Calendar;

public class VeDate {
/**
       * 获取现在时间
       *
       * @return 返回时间类型 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;
}

/**
       * 获取现在时间
       *
       * @return返回短时间格式 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;
}

/**
       * 获取现在时间
       *
       * @return返回字符串格式 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;
}

/**
       * 获取现在时间
       *
       * @return 返回短时间字符串格式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;
}

/**
       * 获取时间 小时:分;秒 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;
}

/**
       * 将长时间格式字符串转换为时间 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;
}

/**
       * 将长时间格式时间转换为字符串 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;
}

/**
       * 将短时间格式时间转换为字符串 yyyy-MM-dd
       *
       * @param dateDate
       * @param k
       * @return
       */
public static String dateToStr(java.util.Date dateDate) {
       SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
       String dateString = formatter.format(dateDate);
       return dateString;
}

/**
       * 将短时间格式字符串转换为时间 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;
}

/**
       * 得到现在时间
       *
       * @return
       */
public static Date getNow() {
       Date currentTime = new Date();
       return currentTime;
}

/**
       * 提取一个月中的最后一天
       *
       * @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;
}

/**
       * 得到现在时间
       *
       * @return 字符串 yyyyMMdd HHmmss
       */
public static String getStringToday() {
       Date currentTime = new Date();
       SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMdd HHmmss");
       String dateString = formatter.format(currentTime);
       return dateString;
}

// 计算当月最后一天,返回字符串
public String getDefaultDay(){ 
      String str = "";
      SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");   

      Calendar lastDate = Calendar.getInstance();
      lastDate.set(Calendar.DATE,1);//设为当前月的1号
      lastDate.add(Calendar.MONTH,1);//加一个月，变为下月的1号
      lastDate.add(Calendar.DATE,-1);//减去一天，变为当月最后一天
  
      str=sdf.format(lastDate.getTime());
      return str; 
}

/**
       * 得到现在小时
       */
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;
}

/**
       * 得到现在分钟
       *
       * @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;
}

/**
       * 根据用户传入的时间表示格式，返回当前时间的格式 如果是yyyyMMdd，注意字母y不能大写。
       *
       * @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;
}

/**
       * 二个小时时间间的差值,必须保证二个时间都是"HH:MM"的格式，返回字符型的分钟
       */
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";
       }
}

/**
       * 得到二个日期间的间隔天数
       */
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 + "";
}

/**
       * 时间前推或后推分钟,其中JJ表示分钟.
       */
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;
}

/**
       * 得到一个时间延后或前移几天的时间,nowdate为时间,delay为前移或后延的天数
       */
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 "";
       }
}

/**
       * 判断是否润年
       *
       * @param ddate
       * @return
       */
public static boolean isLeapYear(String ddate) {

       /**
        * 详细设计： 1.被400整除是闰年，否则： 2.不能被4整除则不是闰年 3.能被4整除同时不能被100整除则是闰年
        * 3.能被4整除同时能被100整除则不是闰年
        */
       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;
}

/**
       * 返回美国时间格式 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);
}

/**
       * 获取一个月的最后一天
       *
       * @param dat
       * @return
       */
public static String getEndDateOfMonth(String dat) {// yyyy-MM-dd
       String str = dat.substring(0,;
       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;
}

/**
       * 判断二个时间是否在同一个周
       *
       * @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)) {
        // 如果12月的最后一周横跨来年第一周的话则最后一周即算做来年的第一周
        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;
}

/**
       * 产生周序列,即得到当前时间所在的年度是第几周
       *
       * @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;
}