JAVA 獲取當前上一周 上一月 上一年的時間

2021-08-29 00:01:28 字數 4981 閱讀 3763

******dateformat format = new ******dateformat("yyyy-mm-dd hh:mm:ss");

calendar c = calendar.getinstance();

1.過去七天

c.settime(new date());

c.add(calendar.date, - 7);

date d = c.gettime();

string day = format.format(d);

system.out.println("過去七天:"+day);

2.過去一月

c.settime(new date());

c.add(calendar.month, -1);

date m = c.gettime();

string mon = format.format(m);

system.out.println("過去乙個月:"+mon);

3.過去三個月

c.settime(new date());

c.add(calendar.month, -3);

date m3 = c.gettime();

string mon3 = format.format(m3);

system.out.println("過去三個月:"+mon3);

4.過去一年

c.settime(new date());

c.add(calendar.year, -1);

date y = c.gettime();

string year = format.format(y);

system.out.println("過去一年:"+year);

5.現在時間24小時制

******dateformat format = new ******dateformat("yyyy-mm-dd hh:mm:ss");  

string nowdate=format.format(new date());  

system.out.println(nowdate);  

6.當天的開始時間

******dateformat format = new ******dateformat("yyyy-mm-dd");  

calendar c = calendar.getinstance();  

string start = format.format(c.gettime())+" 00:00:00";  

system.out.println(start);  

7.當天的截止時間

******dateformat format = new ******dateformat("yyyy-mm-dd");  

calendar calendar = calendar.getinstance();  

string end = format.format(calendar.gettime())+" 23:59:59";  

system.out.println(end);  

8.當前時間的前乙個星期 開始時間

******dateformat format = new ******dateformat("yyyy-mm-dd");  

calendar c = calendar.getinstance();  

c.add(calendar.day_of_month, -6);  

string start = format.format(c.gettime())+" 00:00:00";  

system.out.println(start);  

9.當天日期前乙個月

******dateformat format = new ******dateformat("yyyy-mm-dd");  

calendar c = calendar.getinstance();  

c.add(calendar.month, -1);    //得到前乙個月    

string start = format.format(c.gettime())+" 00:00:00";  

system.out.println(start);  

10.當前時間的前一年開始時間

******dateformat format = new ******dateformat("yyyy-mm-dd");  

calendar c = calendar.getinstance();  

c.add(calendar.year, -1); //年份減1   

string start =format.format(c.gettime())+" 00:00:00";  

system.out.println(start);  

11.當前時間的周一時間和週末時間 setfirstdayofweek()方法

******dateformat format  = new ******dateformat("yyyy-mm-dd ");  

calendar c = calendar.getinstance();  

c.set(calendar.day_of_week,calendar.monday);  

string weekstart = format.format(c.gettime())+" 00:00:00";  

system.out.println(weekstart);  

calendar ca = calendar.getinstance();  

ca.setfirstdayofweek(calendar.monday);  

ca.set(calendar.day_of_week, ca.getfirstdayofweek() + 6); // sunday  

string weekend = format.format(ca.gettime())+" 23:59:59";  

system.out.println(weekend);  

12.當前時所在月份的第一天和最後一天

******dateformat format=new ******dateformat("yyyy-mm-dd");  

calendar c = calendar.getinstance();      

c.set(calendar.day_of_month,1);//設定為1號,當前日期既為本月第一天   

string monthstart = format.format(c.gettime())+" 00:00:00";  

system.out.println(monthstart);  

calendar ca = calendar.getinstance();      

ca.set(calendar.day_of_month, ca.getactualmaximum(calendar.day_of_month));    

string monthend = format.format(ca.gettime())+" 23:59:59";  

system.out.println(monthend);  

13.當期時間所在年份的開始時間

******dateformat format = new ******dateformat("yyyy-mm-dd");  

calendar c = calendar.getinstance();  

c.set(c.get(calendar.year) ,0, 1);//開始時間日期  

string yearstart = format.format(c.gettime())+" 00:00:00";  

system.out.println(yearstart);  

calendar ca = calendar.getinstance();  

ca.set(ca.get(calendar.year) ,11, ca.getactualmaximum(calendar.day_of_month));//結束日期  

string yearend = format.format(ca.gettime())+" 23:59:59";  

system.out.println(yearend);  

14.計算時間差取得兩個時間的微秒級的時間差

//得微秒級時間差

long val = calendarend.gettimeinmillis() - calendarbegin.gettimeinmillis();    

//換算後得到天數

long day = val / (1000 * 60 * 60 * 24);

15.獲取某個時間的上週一和週日

calendar cal = calendar.getinstance();

//n為推遲的週數,1本週,-1向前推遲一周,2下週,依次類推

int n = 1;

string monday;

cal.add(calendar.date, n*7);

//想周幾,這裡就傳幾calendar.monday(tuesday...)

cal.set(calendar.day_of_week,calendar.monday);

monday = new ******dateformat("yyyy-mm-dd").format(cal.gettime());

system.out.println(monday);

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