Question

java 怎样获取每个月的第一天和最后一天

Answer 1

SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd"); 
//获取前月的第一天
Calendar   cal_1=Calendar.getInstance();//获取当前日期 
cal_1.add(Calendar.MONTH, -1);
cal_1.set(Calendar.DAY_OF_MONTH,1);//设置为1号,当前日期既为本月第一天 
firstDay = format.format(cal_1.getTime());
System.out.println("-----1------firstDay:"+firstDay);

//获取前月的最后一天
Calendar cale = Calendar.getInstance();   
cale.set(Calendar.DAY_OF_MONTH,0);//设置为1号,当前日期既为本月第一天 
lastDay = format.format(cale.getTime());
System.out.println("-----2------lastDay:"+lastDay);

//获取当前月第一天：
Calendar c = Calendar.getInstance();    
c.add(Calendar.MONTH, 0);
c.set(Calendar.DAY_OF_MONTH,1);//设置为1号,当前日期既为本月第一天 
String first = format.format(c.getTime());
System.out.println("===============first:"+first);

//获取当前月最后一天
Calendar ca = Calendar.getInstance();    
ca.set(Calendar.DAY_OF_MONTH, ca.getActualMaximum(Calendar.DAY_OF_MONTH));  
String last = format.format(ca.getTime());
System.out.println("===============last:"+last);

追问

能用循环写吗?从 18年1月开始到12月

Answer 2

package com.test.packager;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;

public class Test {
private static String firstDay;
private static String lastDay;
public static void main(String[] args) {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");

//获取前月的第一天
Calendar cal_1=Calendar.getInstance();//获取当前日期
cal_1.add(Calendar.MONTH, -1);
cal_1.set(Calendar.DAY_OF_MONTH,1);//设置为1号,当前日期既为本月第一天
firstDay = format.format(cal_1.getTime());
System.out.println("-----1------firstDay:"+firstDay);
//获取前月的最后一天
Calendar cale = Calendar.getInstance();
cale.set(Calendar.DAY_OF_MONTH,0);//设置为1号,当前日期既为本月第一天
lastDay = format.format(cale.getTime());
System.out.println("-----2------lastDay:"+lastDay);

//获取当前月第一天：
Calendar c = Calendar.getInstance();
c.add(Calendar.MONTH, 0);
c.set(Calendar.DAY_OF_MONTH,1);//设置为1号,当前日期既为本月第一天
String first = format.format(c.getTime());
System.out.println("===============first:"+first);

//获取当前月最后一天
Calendar ca = Calendar.getInstance();
ca.set(Calendar.DAY_OF_MONTH, ca.getActualMaximum(Calendar.DAY_OF_MONTH));
String last = format.format(ca.getTime());
System.out.println("===============last:"+last);

}
/**
* 字符串的日期格式的计算
*/
public static int daysBetween(String smdate,String bdate) throws ParseException{
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);
return Integer.parseInt(String.valueOf(between_days));
}
}

Answer 3

每个城市都有吧，成都当然也是有的，我家就是成都的，房子装修之后也做了甲醛治理，找的是绿色家缘，推荐