Java日期加减
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2022-06-26 08:01:01
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import java.util.*;
import java.text.*;
public class formatDate {
public formatDate() {
}
// 格式化日期为字符串 "yyyy-MM-dd hh:mm"
public String formatDateTime(Date basicDate,String strFormat) {
SimpleDateFormat df = new SimpleDateFormat(strFormat);
return df.format(basicDate);
}
// 格式化日期为字符串 "yyyy-MM-dd hh:mm"
public String formatDateTime(String basicDate,String strFormat) {
SimpleDateFormat df = new SimpleDateFormat(strFormat);
Date tmpDate=null;
try {
tmpDate=df.parse(basicDate);
}
catch(Exception e) {
// 日期型字符串格式错误
}
return df.format(tmpDate);
}
// 当前日期加减n天后的日期,返回String (yyyy-mm-dd)
public String nDaysAftertoday(int n) {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
Calendar rightNow = Calendar.getInstance();
//rightNow.add(Calendar.DAY_OF_MONTH,-1);
rightNow.add(Calendar.DAY_OF_MONTH,+n);
return df.format(rightNow.getTime());
}
// 当前日期加减n天后的日期,返回String (yyyy-mm-dd)
public Date nDaysAfterNowDate(int n) {
Calendar rightNow = Calendar.getInstance();
//rightNow.add(Calendar.DAY_OF_MONTH,-1);
rightNow.add(Calendar.DAY_OF_MONTH,+n);
return rightNow.getTime();
}
// 给定一个日期型字符串,返回加减n天后的日期型字符串
public String nDaysAfterOneDateString(String basicDate,int n) {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
Date tmpDate = null;
try {
tmpDate = df.parse(basicDate);
}
catch(Exception e){
// 日期型字符串格式错误
}
long nDay=(tmpDate.getTime()/(24*60*60*1000)+1+n)*(24*60*60*1000);
tmpDate.setTime(nDay);
return df.format(tmpDate);
}
// 给定一个日期,返回加减n天后的日期
public Date nDaysAfterOneDate(Date basicDate,int n) {
long nDay=(basicDate.getTime()/(24*60*60*1000)+1+n)*(24*60*60*1000);
basicDate.setTime(nDay);
return basicDate;
}
// 计算两个日期相隔的天数
public int nDaysBetweenTwoDate(Date firstDate,Date secondDate) {
int nDay=(int)((secondDate.getTime()-firstDate.getTime())/(24*60*60*1000));
return nDay;
}
// 计算两个日期相隔的天数
public int nDaysBetweenTwoDate(String firstString,String secondString) {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
Date firstDate=null;
Date secondDate=null;
try {
firstDate = df.parse(firstString);
secondDate=df.parse(secondString);
}
catch(Exception e) {
// 日期型字符串格式错误
}
int nDay=(int)((secondDate.getTime()-firstDate.getTime())/(24*60*60*1000));
return nDay;
}
}
import java.text.*;
public class formatDate {
public formatDate() {
}
// 格式化日期为字符串 "yyyy-MM-dd hh:mm"
public String formatDateTime(Date basicDate,String strFormat) {
SimpleDateFormat df = new SimpleDateFormat(strFormat);
return df.format(basicDate);
}
// 格式化日期为字符串 "yyyy-MM-dd hh:mm"
public String formatDateTime(String basicDate,String strFormat) {
SimpleDateFormat df = new SimpleDateFormat(strFormat);
Date tmpDate=null;
try {
tmpDate=df.parse(basicDate);
}
catch(Exception e) {
// 日期型字符串格式错误
}
return df.format(tmpDate);
}
// 当前日期加减n天后的日期,返回String (yyyy-mm-dd)
public String nDaysAftertoday(int n) {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
Calendar rightNow = Calendar.getInstance();
//rightNow.add(Calendar.DAY_OF_MONTH,-1);
rightNow.add(Calendar.DAY_OF_MONTH,+n);
return df.format(rightNow.getTime());
}
// 当前日期加减n天后的日期,返回String (yyyy-mm-dd)
public Date nDaysAfterNowDate(int n) {
Calendar rightNow = Calendar.getInstance();
//rightNow.add(Calendar.DAY_OF_MONTH,-1);
rightNow.add(Calendar.DAY_OF_MONTH,+n);
return rightNow.getTime();
}
// 给定一个日期型字符串,返回加减n天后的日期型字符串
public String nDaysAfterOneDateString(String basicDate,int n) {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
Date tmpDate = null;
try {
tmpDate = df.parse(basicDate);
}
catch(Exception e){
// 日期型字符串格式错误
}
long nDay=(tmpDate.getTime()/(24*60*60*1000)+1+n)*(24*60*60*1000);
tmpDate.setTime(nDay);
return df.format(tmpDate);
}
// 给定一个日期,返回加减n天后的日期
public Date nDaysAfterOneDate(Date basicDate,int n) {
long nDay=(basicDate.getTime()/(24*60*60*1000)+1+n)*(24*60*60*1000);
basicDate.setTime(nDay);
return basicDate;
}
// 计算两个日期相隔的天数
public int nDaysBetweenTwoDate(Date firstDate,Date secondDate) {
int nDay=(int)((secondDate.getTime()-firstDate.getTime())/(24*60*60*1000));
return nDay;
}
// 计算两个日期相隔的天数
public int nDaysBetweenTwoDate(String firstString,String secondString) {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
Date firstDate=null;
Date secondDate=null;
try {
firstDate = df.parse(firstString);
secondDate=df.parse(secondString);
}
catch(Exception e) {
// 日期型字符串格式错误
}
int nDay=(int)((secondDate.getTime()-firstDate.getTime())/(24*60*60*1000));
return nDay;
}
}
package cn.zxlc.excel;
import java.io.FileInputStream;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class Main {
/**
* @param args
* @throws ParseException
*/
public static void main(String[] args) throws ParseException {
//System.out.println(12);
//readExcel();
System.out.println(nDaysAftertoday(60));//当前日期 + 60天的日期
System.out.println(nDaysAfterMonth(2));//当前日期 + 2个月
System.out.println(nDaysAftertoday("2001-2-1",60)); //传入日期 +60天
System.out.println(nDaysAfterMonth("2001-2-1",2)); //传入日期 + 2个月
}
public static String nDaysAftertoday(int n) {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
Calendar rightNow = Calendar.getInstance();
//rightNow.add(Calendar.DAY_OF_MONTH,-1);
rightNow.add(Calendar.DAY_OF_MONTH,+n);
return df.format(rightNow.getTime());
}
public static String nDaysAftertoday(String strDate,int n) throws ParseException {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
Calendar rightNow = Calendar.getInstance();
Date date=df.parse(strDate);
rightNow.setTime(date);
//rightNow.add(Calendar.DAY_OF_MONTH,-1);
rightNow.add(Calendar.DAY_OF_MONTH,+n);
return df.format(rightNow.getTime());
}
public static String nDaysAfterMonth(int n) {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
Calendar rightNow = Calendar.getInstance();
//rightNow.add(Calendar.DAY_OF_MONTH,-1);
//rightNow.add(Calendar.DAY_OF_MONTH,+n);
rightNow.add(Calendar.MONTH,+n);
return df.format(rightNow.getTime());
}
public static String nDaysAfterMonth(String strDate,int n) throws ParseException {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
Calendar rightNow = Calendar.getInstance();
Date date=df.parse(strDate);
rightNow.setTime(date);
//rightNow.add(Calendar.DAY_OF_MONTH,-1);
//rightNow.add(Calendar.DAY_OF_MONTH,+n);
rightNow.add(Calendar.MONTH,+n);
return df.format(rightNow.getTime());
}
}
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