SimpleDateFormat format = new SimpleDateFormat(“yyyy-MM-dd HH:mm:ss”);
Calendar c = Calendar.getInstance();

1.過(guò)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(guò)去七天：”+day);

2.過(guò)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(guò)去一個(gè)月：”+mon);

3.過(guò)去三個(gè)月

c.setTime(new Date()); c.add(Calendar.MONTH, -3); Date m3 = c.getTime(); String mon3 = format.format(m3); System.out.println(“過(guò)去三個(gè)月：”+mon3);

4.過(guò)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(guò)去一年：”+year);

5.現(xiàn)在時(shí)間24小時(shí)制

SimpleDateFormat format = new SimpleDateFormat(“yyyy-MM-dd HH:mm:ss”); String nowDate=format.format(new Date()); System.out.println(nowDate);

6.當(dāng)天的開(kāi)始時(shí)間

SimpleDateFormat format = new SimpleDateFormat(“yyyy-MM-dd”); Calendar c = Calendar.getInstance(); String start = format.format(c.getTime())+" 00:00:00"; System.out.println(start);

7.當(dāng)天的截止時(shí)間

SimpleDateFormat format = new SimpleDateFormat(“yyyy-MM-dd”); Calendar calendar = Calendar.getInstance(); String end = format.format(calendar.getTime())+" 23:59:59"; System.out.println(end);

8.當(dāng)前時(shí)間的前一個(gè)星期 開(kāi)始時(shí)間

SimpleDateFormat format = new SimpleDateFormat(“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(dāng)天日期前一個(gè)月

SimpleDateFormat format = new SimpleDateFormat(“yyyy-MM-dd”); Calendar c = Calendar.getInstance(); c.add(Calendar.MONTH, -1); //得到前一個(gè)月 String start = format.format(c.getTime())+" 00:00:00"; System.out.println(start);

10.當(dāng)前時(shí)間的前一年開(kāi)始時(shí)間

SimpleDateFormat format = new SimpleDateFormat(“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(dāng)前時(shí)間的周一時(shí)間和周末時(shí)間 setfirstdayofweek（）方法

SimpleDateFormat format = new SimpleDateFormat(“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(dāng)前時(shí)所在月份的第一天和最后一天

SimpleDateFormat format=new SimpleDateFormat(“yyyy-MM-dd”); Calendar c = Calendar.getInstance(); c.set(Calendar.DAY_OF_MONTH,1);//設(shè)置為1號(hào),當(dāng)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(dāng)期時(shí)間所在年份的開(kāi)始時(shí)間

SimpleDateFormat format = new SimpleDateFormat(“yyyy-MM-dd”); Calendar c = Calendar.getInstance(); c.set(c.get(Calendar.YEAR) ,0, 1);//開(kāi)始時(shí)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(jié)束日期 String yearEnd = format.format(ca.getTime())+" 23:59:59"; System.out.println(yearEnd);

14.計(jì)算時(shí)間差取得兩個(gè)時(shí)間的微秒級(jí)的時(shí)間差

//得微秒級(jí)時(shí)間差 long val = calendarEnd.getTimeInMillis() - calendarBegin.getTimeInMillis(); //換算后得到天數(shù) long day = val / (1000 * 60 * 60 * 24);

15.獲取某個(gè)時(shí)間的上周一和周日

Calendar cal = Calendar.getInstance(); //n為推遲的周數(shù)，1本周，-1向前推遲一周，2下周，依次類推 int n = 1; String monday; cal.add(Calendar.DATE, n*7); //想周幾，這里就傳幾Calendar.MONDAY（TUESDAY…） cal.set(Calendar.DAY_OF_WEEK,Calendar.MONDAY); monday = new SimpleDateFormat(“yyyy-MM-dd”).format(cal.getTime()); System.out.println(monday);

總結(jié)

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