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  • java获取当前月第一天和最后一天,上个月第一天和最后一天

     1 package com.test.packager;
     2 
     3 import java.text.ParseException;
     4 import java.text.SimpleDateFormat;
     5 import java.util.Calendar;
     6 
     7 public class Test {
     8   private static String firstDay;
     9   private static String lastDay;
    10     public static void main(String[] args) {
    11         SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd"); 
    12         
    13         //获取前月的第一天
    14         Calendar   cal_1=Calendar.getInstance();//获取当前日期 
    15         cal_1.add(Calendar.MONTH, -1);
    16         cal_1.set(Calendar.DAY_OF_MONTH,1);//设置为1号,当前日期既为本月第一天 
    17         firstDay = format.format(cal_1.getTime());
    18         System.out.println("-----1------firstDay:"+firstDay);
    19         //获取前月的最后一天
    20         Calendar cale = Calendar.getInstance();   
    21         cale.set(Calendar.DAY_OF_MONTH,0);//设置为1号,当前日期既为本月第一天 
    22         lastDay = format.format(cale.getTime());
    23         System.out.println("-----2------lastDay:"+lastDay);
    24           
    25           
    26         //获取当前月第一天:
    27         Calendar c = Calendar.getInstance();    
    28         c.add(Calendar.MONTH, 0);
    29         c.set(Calendar.DAY_OF_MONTH,1);//设置为1号,当前日期既为本月第一天 
    30         String first = format.format(c.getTime());
    31         System.out.println("===============first:"+first);
    32           
    33         //获取当前月最后一天
    34         Calendar ca = Calendar.getInstance();    
    35         ca.set(Calendar.DAY_OF_MONTH, ca.getActualMaximum(Calendar.DAY_OF_MONTH));  
    36         String last = format.format(ca.getTime());
    37         System.out.println("===============last:"+last);
    38          
    39     }
    40     /** 
    41    * 字符串的日期格式的计算 
    42    */ 
    43   public static int daysBetween(String smdate,String bdate) throws ParseException{ 
    44           SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd"); 
    45           Calendar cal = Calendar.getInstance(); 
    46           cal.setTime(sdf.parse(smdate)); 
    47           long time1 = cal.getTimeInMillis(); 
    48           cal.setTime(sdf.parse(bdate)); 
    49           long time2 = cal.getTimeInMillis(); 
    50           long between_days=(time2-time1)/(1000*3600*24); 
    51           return Integer.parseInt(String.valueOf(between_days)); 
    52   }
    53 }
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  • 原文地址:https://www.cnblogs.com/lr393993507/p/5542607.html
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