Java获取各种常用时间方法

package
 com.hefeng.test;


import
 java.text.DateFormat;
import
 java.text.ParsePosition;
import
 java.text.SimpleDateFormat;
import
 java.util.Calendar;
import
 java.util.Date;
import
 java.util.GregorianCalendar;

public
 
class
 TimeTest {
    //用来全局控制 上一周，本周，下一周的周数变化
    private
  
int
 weeks = 
0
;
    private
 
int
 MaxDate;
//一月最大天数
    private
 
int
 MaxYear;
//一年最大天数


    /**
     * @param args
     */
    public
 
static
 
void
 main(String[] args) {
        TimeTest tt = new
 TimeTest();
        System.out.println("获取当天日期:"
+tt.getNowTime(
"yyyy-MM-dd"
));
        System.out.println("获取本周一日期:"
+tt.getMondayOFWeek());
        System.out.println("获取本周日的日期~:"
+tt.getCurrentWeekday());
        System.out.println("获取上周一日期:"
+tt.getPreviousWeekday());
        System.out.println("获取上周日日期:"
+tt.getPreviousWeekSunday());
        System.out.println("获取下周一日期:"
+tt.getNextMonday());
        System.out.println("获取下周日日期:"
+tt.getNextSunday());
        System.out.println("获得相应周的周六的日期:"
+tt.getNowTime(
"yyyy-MM-dd"
));
        System.out.println("获取本月第一天日期:"
+tt.getFirstDayOfMonth());
        System.out.println("获取本月最后一天日期:"
+tt.getDefaultDay());
        System.out.println("获取上月第一天日期:"
+tt.getPreviousMonthFirst());
        System.out.println("获取上月最后一天的日期:"
+tt.getPreviousMonthEnd());
        System.out.println("获取下月第一天日期:"
+tt.getNextMonthFirst());
        System.out.println("获取下月最后一天日期:"
+tt.getNextMonthEnd());
        System.out.println("获取本年的第一天日期:"
+tt.getCurrentYearFirst());
        System.out.println("获取本年最后一天日期:"
+tt.getCurrentYearEnd());
        System.out.println("获取去年的第一天日期:"
+tt.getPreviousYearFirst());
        System.out.println("获取去年的最后一天日期:"
+tt.getPreviousYearEnd());
        System.out.println("获取明年第一天日期:"
+tt.getNextYearFirst());
        System.out.println("获取明年最后一天日期:"
+tt.getNextYearEnd());
        System.out.println("获取本季度第一天到最后一天:"
+tt.getThisSeasonTime(
11
));
        System.out.println("获取两个日期之间间隔天数2008-12-1~2008-9.29:"
+TimeTest.getTwoDay(
"2008-12-1"
,
"2008-9-29"
));
    }


    /**
        * 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 + 
""
;
    }


    /**
        * 根据一个日期，返回是星期几的字符串
        *
        * @param sdate
        * @return
        */
    public
 
static
 String getWeek(String sdate) {
        // 再转换为时间
        Date date = TimeTest.strToDate(sdate);
        Calendar c = Calendar.getInstance();
        c.setTime(date);
        // int hour=c.get(Calendar.DAY_OF_WEEK);
        // hour中存的就是星期几了，其范围 1~7
        // 1=星期日 7=星期六，其他类推
        return
 
new
 SimpleDateFormat(
"EEEE"
).format(c.getTime());
    }

    /**
        * 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;
    }

    /**
        * 两个时间之间的天数
        *
        * @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
;
        // 转换为标准时间
        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;
    }




    // 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;
    }

    // 上月第一天
    public
 String getPreviousMonthFirst(){
       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
);
//减一个月，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;
    }

    //获取当月第一天
    public
 String getFirstDayOfMonth(){
       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
       str=sdf.format(lastDate.getTime());
       return
 str;
    }

    // 获得本周星期日的日期
    public
 String getCurrentWeekday() {
        weeks = 0
;
        int
 mondayPlus = 
this
.getMondayPlus();
        GregorianCalendar currentDate = new
 GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus+6
);
        Date monday = currentDate.getTime();

        DateFormat df = DateFormat.getDateInstance();
        String preMonday = df.format(monday);
        return
 preMonday;
    }


    //获取当天时间
    public
 String getNowTime(String dateformat){
        Date   now   =   new
   Date();
        SimpleDateFormat   dateFormat   =   new
   SimpleDateFormat(dateformat);
//可以方便地修改日期格式
        String  hehe  = dateFormat.format(now);
        return
 hehe;
    }

    // 获得当前日期与本周日相差的天数
    private
 
int
 getMondayPlus() {
        Calendar cd = Calendar.getInstance();
        // 获得今天是一周的第几天，星期日是第一天，星期二是第二天......
        int
 dayOfWeek = cd.get(Calendar.DAY_OF_WEEK)-
1
;         
//因为按中国礼拜一作为第一天所以这里减1
        if
 (dayOfWeek == 
1
) {
            return
 
0
;
        } else
 {
            return
 
1
 - dayOfWeek;
        }
    }

    //获得本周一的日期
    public
 String getMondayOFWeek(){
         weeks = 0
;
         int
 mondayPlus = 
this
.getMondayPlus();
         GregorianCalendar currentDate = new
 GregorianCalendar();
         currentDate.add(GregorianCalendar.DATE, mondayPlus);
         Date monday = currentDate.getTime();

         DateFormat df = DateFormat.getDateInstance();
         String preMonday = df.format(monday);
         return
 preMonday;
    }

  //获得相应周的周六的日期
    public
 String getSaturday() {
        int
 mondayPlus = 
this
.getMondayPlus();
        GregorianCalendar currentDate = new
 GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus + 7
 * weeks + 
6
);
        Date monday = currentDate.getTime();
        DateFormat df = DateFormat.getDateInstance();
        String preMonday = df.format(monday);
        return
 preMonday;
    }

 // 获得上周星期日的日期
    public
 String getPreviousWeekSunday() {
        weeks=0
;
        weeks--;
        int
 mondayPlus = 
this
.getMondayPlus();
        GregorianCalendar currentDate = new
 GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus+weeks);
        Date monday = currentDate.getTime();
        DateFormat df = DateFormat.getDateInstance();
        String preMonday = df.format(monday);
        return
 preMonday;
    }

 // 获得上周星期一的日期
    public
 String getPreviousWeekday() {
        weeks--;
        int
 mondayPlus = 
this
.getMondayPlus();
        GregorianCalendar currentDate = new
 GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus + 7
 * weeks);
        Date monday = currentDate.getTime();
        DateFormat df = DateFormat.getDateInstance();
        String preMonday = df.format(monday);
        return
 preMonday;
    }

    // 获得下周星期一的日期
    public
 String getNextMonday() {
        weeks++;
        int
 mondayPlus = 
this
.getMondayPlus();
        GregorianCalendar currentDate = new
 GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus + 7
);
        Date monday = currentDate.getTime();
        DateFormat df = DateFormat.getDateInstance();
        String preMonday = df.format(monday);
        return
 preMonday;
    }

 // 获得下周星期日的日期
    public
 String getNextSunday() {

        int
 mondayPlus = 
this
.getMondayPlus();
        GregorianCalendar currentDate = new
 GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus + 7
+
6
);
        Date monday = currentDate.getTime();
        DateFormat df = DateFormat.getDateInstance();
        String preMonday = df.format(monday);
        return
 preMonday;
    }



    private
 
int
 getMonthPlus(){
        Calendar cd = Calendar.getInstance();
        int
 monthOfNumber = cd.get(Calendar.DAY_OF_MONTH);
        cd.set(Calendar.DATE, 1
);
//把日期设置为当月第一天
        cd.roll(Calendar.DATE, -1
);
//日期回滚一天，也就是最后一天
        MaxDate=cd.get(Calendar.DATE);
        if
(monthOfNumber == 
1
){
            return
 -MaxDate;
        }else
{
            return
 
1
-monthOfNumber;
        }
    }

  //获得上月最后一天的日期
    public
 String getPreviousMonthEnd(){
        String str = ""
;
       SimpleDateFormat sdf=new
 SimpleDateFormat(
"yyyy-MM-dd"
);

       Calendar lastDate = Calendar.getInstance();
      lastDate.add(Calendar.MONTH,-1
);
//减一个月
      lastDate.set(Calendar.DATE, 1
);
//把日期设置为当月第一天
      lastDate.roll(Calendar.DATE, -1
);
//日期回滚一天，也就是本月最后一天
       str=sdf.format(lastDate.getTime());
       return
 str;
    }

  //获得下个月第一天的日期
    public
 String getNextMonthFirst(){
        String str = ""
;
       SimpleDateFormat sdf=new
 SimpleDateFormat(
"yyyy-MM-dd"
);

       Calendar lastDate = Calendar.getInstance();
      lastDate.add(Calendar.MONTH,1
);
//减一个月
      lastDate.set(Calendar.DATE, 1
);
//把日期设置为当月第一天
       str=sdf.format(lastDate.getTime());
       return
 str;
    }

  //获得下个月最后一天的日期
    public
 String getNextMonthEnd(){
        String str = ""
;
       SimpleDateFormat sdf=new
 SimpleDateFormat(
"yyyy-MM-dd"
);

       Calendar lastDate = Calendar.getInstance();
      lastDate.add(Calendar.MONTH,1
);
//加一个月
      lastDate.set(Calendar.DATE, 1
);
//把日期设置为当月第一天
      lastDate.roll(Calendar.DATE, -1
);
//日期回滚一天，也就是本月最后一天
       str=sdf.format(lastDate.getTime());
       return
 str;
    }

    //获得明年最后一天的日期
    public
 String getNextYearEnd(){
        String str = ""
;
       SimpleDateFormat sdf=new
 SimpleDateFormat(
"yyyy-MM-dd"
);

      Calendar lastDate = Calendar.getInstance();
      lastDate.add(Calendar.YEAR,1
);
//加一个年
      lastDate.set(Calendar.DAY_OF_YEAR, 1
);
     lastDate.roll(Calendar.DAY_OF_YEAR, -1
);
       str=sdf.format(lastDate.getTime());
       return
 str;
    }

  //获得明年第一天的日期
    public
 String getNextYearFirst(){
        String str = ""
;
       SimpleDateFormat sdf=new
 SimpleDateFormat(
"yyyy-MM-dd"
);

      Calendar lastDate = Calendar.getInstance();
      lastDate.add(Calendar.YEAR,1
);
//加一个年
      lastDate.set(Calendar.DAY_OF_YEAR, 1
);
           str=sdf.format(lastDate.getTime());
      return
 str;

    }

  //获得本年有多少天
    private
 
int
 getMaxYear(){
        Calendar cd = Calendar.getInstance();
        cd.set(Calendar.DAY_OF_YEAR,1
);
//把日期设为当年第一天
        cd.roll(Calendar.DAY_OF_YEAR,-1
);
//把日期回滚一天。
        int
 MaxYear = cd.get(Calendar.DAY_OF_YEAR);
        return
 MaxYear;
    }

    private
 
int
 getYearPlus(){
        Calendar cd = Calendar.getInstance();
        int
 yearOfNumber = cd.get(Calendar.DAY_OF_YEAR);
//获得当天是一年中的第几天
        cd.set(Calendar.DAY_OF_YEAR,1
);
//把日期设为当年第一天
        cd.roll(Calendar.DAY_OF_YEAR,-1
);
//把日期回滚一天。
        int
 MaxYear = cd.get(Calendar.DAY_OF_YEAR);
        if
(yearOfNumber == 
1
){
            return
 -MaxYear;
        }else
{
            return
 
1
-yearOfNumber;
        }
    }
  //获得本年第一天的日期
    public
 String getCurrentYearFirst(){
        int
 yearPlus = 
this
.getYearPlus();
        GregorianCalendar currentDate = new
 GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE,yearPlus);
        Date yearDay = currentDate.getTime();
        DateFormat df = DateFormat.getDateInstance();
        String preYearDay = df.format(yearDay);
        return
 preYearDay;
    }


  //获得本年最后一天的日期 *
    public
 String getCurrentYearEnd(){
        Date date = new
 Date();
        SimpleDateFormat   dateFormat   =   new
   SimpleDateFormat(
"yyyy"
);
//可以方便地修改日期格式
        String  years  = dateFormat.format(date);
        return
 years+
"-12-31"
;
    }


  //获得上年第一天的日期 *
    public
 String getPreviousYearFirst(){
        Date date = new
 Date();
        SimpleDateFormat   dateFormat   =   new
   SimpleDateFormat(
"yyyy"
);
//可以方便地修改日期格式
        String  years  = dateFormat.format(date); int
 years_value = Integer.parseInt(years);
        years_value--;
        return
 years_value+
"-1-1"
;
    }

  //获得上年最后一天的日期
    public
 String getPreviousYearEnd(){
        weeks--;
        int
 yearPlus = 
this
.getYearPlus();
        GregorianCalendar currentDate = new
 GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE,yearPlus+MaxYear*weeks+(MaxYear-1
));
        Date yearDay = currentDate.getTime();
        DateFormat df = DateFormat.getDateInstance();
        String preYearDay = df.format(yearDay);
        getThisSeasonTime(11
);
        return
 preYearDay;
    }

  //获得本季度
    public
 String getThisSeasonTime(
int
 month){
        int
 array[][] = {{
1
,
2
,
3
},{
4
,
5
,
6
},{
7
,
8
,
9
},{
10
,
11
,
12
}};
        int
 season = 
1
;
        if
(month>=
1
&&month<=
3
){
            season = 1
;
        }
        if
(month>=
4
&&month<=
6
){
            season = 2
;
        }
        if
(month>=
7
&&month<=
9
){
            season = 3
;
        }
        if
(month>=
10
&&month<=
12
){
            season = 4
;
        }
        int
 start_month = array[season-
1
][
0
];
        int
 end_month = array[season-
1
][
2
];

        Date date = new
 Date();
        SimpleDateFormat   dateFormat   =   new
   SimpleDateFormat(
"yyyy"
);
//可以方便地修改日期格式
        String  years  = dateFormat.format(date);
        int
 years_value = Integer.parseInt(years);

        int
 start_days =
1
;
//years+"-"+String.valueOf(start_month)+"-1";//getLastDayOfMonth(years_value,start_month);
        int
 end_days = getLastDayOfMonth(years_value,end_month);
        String seasonDate = years_value+"-"
+start_month+
"-"
+start_days+
";"
+years_value+
"-"
+end_month+
"-"
+end_days;
        return
 seasonDate;

    }

    /**
     * 获取某年某月的最后一天
     * @param year 年
     * @param month 月
     * @return 最后一天
     */
   private
 
int
 getLastDayOfMonth(
int
 year, 
int
 month) {
         if
 (month == 
1
 || month == 
3
 || month == 
5
 || month == 
7
 || month == 
8
                   || month == 10
 || month == 
12
) {
               return
 
31
;
         }
         if
 (month == 
4
 || month == 
6
 || month == 
9
 || month == 
11
) {
               return
 
30
;
         }
         if
 (month == 
2
) {
               if
 (isLeapYear(year)) {
                   return
 
29
;
               } else
 {
                   return
 
28
;
               }
         }
         return
 
0
;
   }
   /**
    * 是否闰年
    * @param year 年
    * @return
    */
  public
 
boolean
 isLeapYear(
int
 year) {
        return
 (year % 
4
 == 
0
 && year % 
100
 != 
0
) || (year % 
400
 == 
0
);
  }
}