java中年月日的加减法使用示例

目录java计算两个年月日之间相差的天数：publicstaticintdaysBetween(Stringsmdate,Stringbdate)throwsParseExceptio...

目录

Java计算两个年月日之间相差的天数：

public static int daysBetween(String smdate,String bdate) throws ParseException{
    int daysInterval=0;
    if(StringUtils.isNoneBlank(smdate)&&StringUtils.isNoneBlank(bdate)){
      SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd"); 
      Calendar cal = Calendar.getInstance();  
      cal.setTime(sdf.parse(smdate));  
      long time1 = cal.getTimeInMillis();        
      cal.setTime(sdf.parse(bdate));  
      long time2 = cal.getTimeInMillis();    
      long between_days=(time2-time1)/(1000*3600*24);
      daysInterval = Integer.parseInt(String.valueOf(between_days));
    }
     
   return daysInterval;  
  } 

java计算年月之间的加法和减法：

public static void main(String[] args) throws ParseException
  {
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM"); 
    String time=sdf.format(new Date());
    Calendar cd = Calendar.getInstance();
    cd.setTime(sdf.parse(time));
    cd.add(Calendar.MONTH, 0);//往前一月，，如果是整数则进行加法，如果是负数，则进行减法  
    Date date=cd.getTime(); 
    String endTimeString = sdf.format(date);
    cd.add(Calendar.MONTH, -7);//往后7个月
    String startTimeString = sdf.format(cd.getTime());
    String startTime = startTimeString.replaceAll("-", "");//格式日期yyyyMM
    String endTime = endTimeString.replaceAll("-", "");//格式日期yyyyMM
    System.out.println(startTime);
    System.out.println(endTime);
  }  
   
   

获取一个月中的第一天和最后一天：

public static void main(String[] args)
  {
    // 获取当前年份、月份、日期 
    Calendar cale = null; 
    cale = Calendar.getInstance(); 
    // 获取当月第一天和最后一天 
    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd"); 
    // 获取前月的第一天 
    cale = Calendar.getInstance(); 
    cale.add(Calendarwww.cppcns.com.MONTH, -6); 
    cale.set(Calendar.DAY_OF_MONTH, 1); 
    String startTimeString = format.format(cale.getTime()); 
    // 获取前月的最后一天 
    cale = Calendar.getInstance(); 
    cale.add(Calendar.MONTH, 0); 
    cale.set(Calendar.DAY_OF_MONTH, 0); 
    String endTimeString = format.format(cale.getTime()); 
    String startTime =startTimeString.replaceAll("-", "");//格式日期yyyyMMdd
    String endTime =endTimeString.replaceAll("-", "");//格式日期yyyyMMdd
    String layerTime = startTimeString +"至"+endTimeString;
    System.out.println(layerTime);
  }
 
 

计算两个月份之间相差的月份个数：

public int getMonthInterval(String str1,String str2) throws ParseException{
    int monthLength = 0;
    if(StringUtils.isNoneBlank(str1)&& StringUtils.isNoneBlank(str2)){
      SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
      Calendar bef = Calendar.getInstance();
      Calendar aft = Calendar.getInstance();
      bef.setTime(sdf.parse(str1));
      aft.setTime(sdf.parse(str2));
      int result = aft.get(Calendar.MONTH) - bef.get(Calendar.MONTH);
      int month = (aft.get(Calendar.YEAR) - bef.get(Calendar.YEAR)) * 12;
      monthLength = Math.abs(month + result);
    }
   return monthLength;
  }
 

java对当前月份进行传值计算：

 public static Map<String,Object> getMonth(int length) throws ParseException{
    Map<String, Object> map = new HashMap<>();
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM"); 
    String time=sdf.format(new Date());
    Calendar cd = Calendar.getInstance();
    cd.setTime(sdf.parse(time));
    cd.add(Calendar.MONTH, -length);//往前一月  
    Date date=cd.getTime(); 
    String monthFormat= sdf.format(date);
//    System.out.println(monthFormat);
    String monthString =monthFormat.replaceAll("-", "");//格式日期yyyyMM
    map.put("monthFormat", monthFormat);
    map.put("monthString", monthString);
    return map;
  }

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