Java获取各种常用时间方法-优快云博客

本文链接：https://blog.youkuaiyun.com/yyangbb/article/details/83731444

本文提供了一系列Java代码示例，展示了如何进行日期与时间的操作，包括获取当前日期、本周日期范围、上个月及下个月的日期等实用功能。

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Java代码

package com.hefeng.test;
import java.text.DateFormat;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
public class TimeTest {
//用来全局控制上一周，本周，下一周的周数变化
private int weeks = 0 ;
private int MaxDate; //一月最大天数
private int MaxYear; //一年最大天数
/**
* @param args
*/
public static void main(String[] args) {
TimeTest tt = new TimeTest();
System.out.println("获取当天日期:" +tt.getNowTime( "yyyy-MM-dd" ));
System.out.println("获取本周一日期:" +tt.getMondayOFWeek());
System.out.println("获取本周日的日期~:" +tt.getCurrentWeekday());
System.out.println("获取上周一日期:" +tt.getPreviousWeekday());
System.out.println("获取上周日日期:" +tt.getPreviousWeekSunday());
System.out.println("获取下周一日期:" +tt.getNextMonday());
System.out.println("获取下周日日期:" +tt.getNextSunday());
System.out.println("获得相应周的周六的日期:" +tt.getNowTime( "yyyy-MM-dd" ));
System.out.println("获取本月第一天日期:" +tt.getFirstDayOfMonth());
System.out.println("获取本月最后一天日期:" +tt.getDefaultDay());
System.out.println("获取上月第一天日期:" +tt.getPreviousMonthFirst());
System.out.println("获取上月最后一天的日期:" +tt.getPreviousMonthEnd());
System.out.println("获取下月第一天日期:" +tt.getNextMonthFirst());
System.out.println("获取下月最后一天日期:" +tt.getNextMonthEnd());
System.out.println("获取本年的第一天日期:" +tt.getCurrentYearFirst());
System.out.println("获取本年最后一天日期:" +tt.getCurrentYearEnd());
System.out.println("获取去年的第一天日期:" +tt.getPreviousYearFirst());
System.out.println("获取去年的最后一天日期:" +tt.getPreviousYearEnd());
System.out.println("获取明年第一天日期:" +tt.getNextYearFirst());
System.out.println("获取明年最后一天日期:" +tt.getNextYearEnd());
System.out.println("获取本季度第一天到最后一天:" +tt.getThisSeasonTime( 11 ));
System.out.println("获取两个日期之间间隔天数2008-12-1~2008-9.29:" +TimeTest.getTwoDay( "2008-12-1" , "2008-9-29" ));
}
/**
* 得到二个日期间的间隔天数
*/
public static String getTwoDay(String sj1, String sj2) {
SimpleDateFormat myFormatter = new SimpleDateFormat( "yyyy-MM-dd" );
long day = 0 ;
try {
java.util.Date date = myFormatter.parse(sj1);
java.util.Date mydate = myFormatter.parse(sj2);
day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000 );
} catch (Exception e) {
return "" ;
}
return day + "" ;
}
/**
* 根据一个日期，返回是星期几的字符串
*
* @param sdate
* @return
*/
public static String getWeek(String sdate) {
// 再转换为时间
Date date = TimeTest.strToDate(sdate);
Calendar c = Calendar.getInstance();
c.setTime(date);
// int hour=c.get(Calendar.DAY_OF_WEEK);
// hour中存的就是星期几了，其范围 1~7
// 1=星期日 7=星期六，其他类推
return new SimpleDateFormat( "EEEE" ).format(c.getTime());
}
/**
* 将短时间格式字符串转换为时间 yyyy-MM-dd
*
* @param strDate
* @return
*/
public static Date strToDate(String strDate) {
SimpleDateFormat formatter = new SimpleDateFormat( "yyyy-MM-dd" );
ParsePosition pos = new ParsePosition( 0 );
Date strtodate = formatter.parse(strDate, pos);
return strtodate;
}
/**
* 两个时间之间的天数
*
* @param date1
* @param date2
* @return
*/
public static long getDays(String date1, String date2) {
if (date1 == null || date1.equals( "" ))
return 0 ;
if (date2 == null || date2.equals( "" ))
return 0 ;
// 转换为标准时间
SimpleDateFormat myFormatter = new SimpleDateFormat( "yyyy-MM-dd" );
java.util.Date date = null ;
java.util.Date mydate = null ;
try {
date = myFormatter.parse(date1);
mydate = myFormatter.parse(date2);
} catch (Exception e) {
}
long day = (date.getTime() - mydate.getTime()) / ( 24 * 60 * 60 * 1000 );
return day;
}
// 计算当月最后一天,返回字符串
public String getDefaultDay(){
String str = "" ;
SimpleDateFormat sdf=new SimpleDateFormat( "yyyy-MM-dd" );
Calendar lastDate = Calendar.getInstance();
lastDate.set(Calendar.DATE,1 ); //设为当前月的1号
lastDate.add(Calendar.MONTH,1 ); //加一个月，变为下月的1号
lastDate.add(Calendar.DATE,-1 ); //减去一天，变为当月最后一天
str=sdf.format(lastDate.getTime());
return str;
}
// 上月第一天
public String getPreviousMonthFirst(){
String str = "" ;
SimpleDateFormat sdf=new SimpleDateFormat( "yyyy-MM-dd" );
Calendar lastDate = Calendar.getInstance();
lastDate.set(Calendar.DATE,1 ); //设为当前月的1号
lastDate.add(Calendar.MONTH,-1 ); //减一个月，变为下月的1号
//lastDate.add(Calendar.DATE,-1);//减去一天，变为当月最后一天
str=sdf.format(lastDate.getTime());
return str;
}
//获取当月第一天
public String getFirstDayOfMonth(){
String str = "" ;
SimpleDateFormat sdf=new SimpleDateFormat( "yyyy-MM-dd" );
Calendar lastDate = Calendar.getInstance();
lastDate.set(Calendar.DATE,1 ); //设为当前月的1号
str=sdf.format(lastDate.getTime());
return str;
}
// 获得本周星期日的日期
public String getCurrentWeekday() {
weeks = 0 ;
int mondayPlus = this .getMondayPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE, mondayPlus+6 );
Date monday = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preMonday = df.format(monday);
return preMonday;
}
//获取当天时间
public String getNowTime(String dateformat){
Date now = new Date();
SimpleDateFormat dateFormat = new SimpleDateFormat(dateformat); //可以方便地修改日期格式
String hehe = dateFormat.format(now);
return hehe;
}
// 获得当前日期与本周日相差的天数
private int getMondayPlus() {
Calendar cd = Calendar.getInstance();
// 获得今天是一周的第几天，星期日是第一天，星期二是第二天......
int dayOfWeek = cd.get(Calendar.DAY_OF_WEEK)- 1 ; //因为按中国礼拜一作为第一天所以这里减1
if (dayOfWeek == 1 ) {
return 0 ;
} else {
return 1 - dayOfWeek;
}
}
//获得本周一的日期
public String getMondayOFWeek(){
weeks = 0 ;
int mondayPlus = this .getMondayPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE, mondayPlus);
Date monday = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preMonday = df.format(monday);
return preMonday;
}
//获得相应周的周六的日期
public String getSaturday() {
int mondayPlus = this .getMondayPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks + 6 );
Date monday = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preMonday = df.format(monday);
return preMonday;
}
// 获得上周星期日的日期
public String getPreviousWeekSunday() {
weeks=0 ;
weeks--;
int mondayPlus = this .getMondayPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE, mondayPlus+weeks);
Date monday = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preMonday = df.format(monday);
return preMonday;
}
// 获得上周星期一的日期
public String getPreviousWeekday() {
weeks--;
int mondayPlus = this .getMondayPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks);
Date monday = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preMonday = df.format(monday);
return preMonday;
}
// 获得下周星期一的日期
public String getNextMonday() {
weeks++;
int mondayPlus = this .getMondayPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 );
Date monday = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preMonday = df.format(monday);
return preMonday;
}
// 获得下周星期日的日期
public String getNextSunday() {
int mondayPlus = this .getMondayPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 + 6 );
Date monday = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preMonday = df.format(monday);
return preMonday;
}
private int getMonthPlus(){
Calendar cd = Calendar.getInstance();
int monthOfNumber = cd.get(Calendar.DAY_OF_MONTH);
cd.set(Calendar.DATE, 1 ); //把日期设置为当月第一天
cd.roll(Calendar.DATE, -1 ); //日期回滚一天，也就是最后一天
MaxDate=cd.get(Calendar.DATE);
if (monthOfNumber == 1 ){
return -MaxDate;
}else {
return 1 -monthOfNumber;
}
}
//获得上月最后一天的日期
public String getPreviousMonthEnd(){
String str = "" ;
SimpleDateFormat sdf=new SimpleDateFormat( "yyyy-MM-dd" );
Calendar lastDate = Calendar.getInstance();
lastDate.add(Calendar.MONTH,-1 ); //减一个月
lastDate.set(Calendar.DATE, 1 ); //把日期设置为当月第一天
lastDate.roll(Calendar.DATE, -1 ); //日期回滚一天，也就是本月最后一天
str=sdf.format(lastDate.getTime());
return str;
}
//获得下个月第一天的日期
public String getNextMonthFirst(){
String str = "" ;
SimpleDateFormat sdf=new SimpleDateFormat( "yyyy-MM-dd" );
Calendar lastDate = Calendar.getInstance();
lastDate.add(Calendar.MONTH,1 ); //减一个月
lastDate.set(Calendar.DATE, 1 ); //把日期设置为当月第一天
str=sdf.format(lastDate.getTime());
return str;
}
//获得下个月最后一天的日期
public String getNextMonthEnd(){
String str = "" ;
SimpleDateFormat sdf=new SimpleDateFormat( "yyyy-MM-dd" );
Calendar lastDate = Calendar.getInstance();
lastDate.add(Calendar.MONTH,1 ); //加一个月
lastDate.set(Calendar.DATE, 1 ); //把日期设置为当月第一天
lastDate.roll(Calendar.DATE, -1 ); //日期回滚一天，也就是本月最后一天
str=sdf.format(lastDate.getTime());
return str;
}
//获得明年最后一天的日期
public String getNextYearEnd(){
String str = "" ;
SimpleDateFormat sdf=new SimpleDateFormat( "yyyy-MM-dd" );
Calendar lastDate = Calendar.getInstance();
lastDate.add(Calendar.YEAR,1 ); //加一个年
lastDate.set(Calendar.DAY_OF_YEAR, 1 );
lastDate.roll(Calendar.DAY_OF_YEAR, -1 );
str=sdf.format(lastDate.getTime());
return str;
}
//获得明年第一天的日期
public String getNextYearFirst(){
String str = "" ;
SimpleDateFormat sdf=new SimpleDateFormat( "yyyy-MM-dd" );
Calendar lastDate = Calendar.getInstance();
lastDate.add(Calendar.YEAR,1 ); //加一个年
lastDate.set(Calendar.DAY_OF_YEAR, 1 );
str=sdf.format(lastDate.getTime());
return str;
}
//获得本年有多少天
private int getMaxYear(){
Calendar cd = Calendar.getInstance();
cd.set(Calendar.DAY_OF_YEAR,1 ); //把日期设为当年第一天
cd.roll(Calendar.DAY_OF_YEAR,-1 ); //把日期回滚一天。
int MaxYear = cd.get(Calendar.DAY_OF_YEAR);
return MaxYear;
}
private int getYearPlus(){
Calendar cd = Calendar.getInstance();
int yearOfNumber = cd.get(Calendar.DAY_OF_YEAR); //获得当天是一年中的第几天
cd.set(Calendar.DAY_OF_YEAR,1 ); //把日期设为当年第一天
cd.roll(Calendar.DAY_OF_YEAR,-1 ); //把日期回滚一天。
int MaxYear = cd.get(Calendar.DAY_OF_YEAR);
if (yearOfNumber == 1 ){
return -MaxYear;
}else {
return 1 -yearOfNumber;
}
}
//获得本年第一天的日期
public String getCurrentYearFirst(){
int yearPlus = this .getYearPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE,yearPlus);
Date yearDay = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preYearDay = df.format(yearDay);
return preYearDay;
}
//获得本年最后一天的日期 *
public String getCurrentYearEnd(){
Date date = new Date();
SimpleDateFormat dateFormat = new SimpleDateFormat( "yyyy" ); //可以方便地修改日期格式
String years = dateFormat.format(date);
return years+ "-12-31" ;
}
//获得上年第一天的日期 *
public String getPreviousYearFirst(){
Date date = new Date();
SimpleDateFormat dateFormat = new SimpleDateFormat( "yyyy" ); //可以方便地修改日期格式
String years = dateFormat.format(date); int years_value = Integer.parseInt(years);
years_value--;
return years_value+ "-1-1" ;
}
//获得上年最后一天的日期
public String getPreviousYearEnd(){
weeks--;
int yearPlus = this .getYearPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE,yearPlus+MaxYear*weeks+(MaxYear-1 ));
Date yearDay = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preYearDay = df.format(yearDay);
getThisSeasonTime(11 );
return preYearDay;
}
//获得本季度
public String getThisSeasonTime( int month){
int array[][] = {{ 1 , 2 , 3 },{ 4 , 5 , 6 },{ 7 , 8 , 9 },{ 10 , 11 , 12 }};
int season = 1 ;
if (month>= 1 &&month<= 3 ){
season = 1 ;
}
if (month>= 4 &&month<= 6 ){
season = 2 ;
}
if (month>= 7 &&month<= 9 ){
season = 3 ;
}
if (month>= 10 &&month<= 12 ){
season = 4 ;
}
int start_month = array[season- 1 ][ 0 ];
int end_month = array[season- 1 ][ 2 ];
Date date = new Date();
SimpleDateFormat dateFormat = new SimpleDateFormat( "yyyy" ); //可以方便地修改日期格式
String years = dateFormat.format(date);
int years_value = Integer.parseInt(years);
int start_days = 1 ; //years+"-"+String.valueOf(start_month)+"-1";//getLastDayOfMonth(years_value,start_month);
int end_days = getLastDayOfMonth(years_value,end_month);
String seasonDate = years_value+"-" +start_month+ "-" +start_days+ ";" +years_value+ "-" +end_month+ "-" +end_days;
return seasonDate;
}
/**
* 获取某年某月的最后一天
* @param year 年
* @param month 月
* @return 最后一天
*/
private int getLastDayOfMonth( int year, int month) {
if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8
|| month == 10 || month == 12 ) {
return 31 ;
}
if (month == 4 || month == 6 || month == 9 || month == 11 ) {
return 30 ;
}
if (month == 2 ) {
if (isLeapYear(year)) {
return 29 ;
} else {
return 28 ;
}
}
return 0 ;
}
/**
* 是否闰年
* @param year 年
* @return
*/
public boolean isLeapYear( int year) {
return (year % 4 == 0 && year % 100 != 0 ) || (year % 400 == 0 );
}
}