The code copy is as follows:
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.TimeZone;
/**
* Time processing function
*
* @20080509 15:50
*/
public class DateUtil {
private static final String DEFAULT_PATTERN = "yyyy-MM-dd HH:mm:ss";
public static final String TIME_YEAR = "yyyy";
public static final String TIME_MONEN = "MM";
public static final String TIME_DAY = "dd";
public static String getDate(String interval, Date starttime, String pattern) {
Calendar temp = Calendar.getInstance(TimeZone.getDefault());
temp.setTime(starttime);
temp.add(temp.MONTH, Integer.parseInt(interval));
SimpleDateFormat sdf = new SimpleDateFormat(pattern);
return sdf.format(temp.getTime());
}
/**
* Convert string type to time type
*
* @return
*/
public static Date str2Date(String str) {
Date d = null;
SimpleDateFormat sdf = new SimpleDateFormat(DEFAULT_PATTERN);
try {
d = sdf.parse(str);
} catch (Exception e) {
e.printStackTrace();
}
return d;
}
public static Date str2Date(String str, String pattern) {
Date d = null;
SimpleDateFormat sdf = new SimpleDateFormat(pattern);
try {
d = sdf.parse(str);
} catch (Exception e) {
e.printStackTrace();
}
return d;
}
/**
* Format the time
*
* @return
*/
public static Date DatePattern(Date date) {
SimpleDateFormat sdf = new SimpleDateFormat(DEFAULT_PATTERN);
try {
String dd = sdf.format(date);
date = str2Date(dd);
} catch (Exception e) {
e.printStackTrace();
}
return date;
}
/**
* Format the time
*/
public static Date DatePattern(Date date, String pattern) {
SimpleDateFormat sdf = new SimpleDateFormat(pattern);
try {
String dd = sdf.format(date);
date = str2Date(dd, pattern);
} catch (Exception e) {
e.printStackTrace();
}
return date;
}
public static String date2Str(Date date) {
SimpleDateFormat sdf = new SimpleDateFormat(DEFAULT_PATTERN);
return sdf.format(date);
}
public static String date2Str(Date date, String format) {
SimpleDateFormat sdf = new SimpleDateFormat(format);
return sdf.format(date);
}
/**
* Get Yesterday
*
* @param date
* @return
* @throws Exception
*/
public static Date getLastDate(Date date) {
Calendar calendar = Calendar.getInstance(TimeZone.getDefault());
calendar.setTime(date);
calendar.add(calendar.DATE, -1);
return str2Date(date2Str(calendar.getTime()));
}
/**
* Get it a few days ago
* @param date
* @return
*/
public static Date getBeforeDate(Date date,int dates) {
Calendar calendar = Calendar.getInstance(TimeZone.getDefault());
calendar.setTime(date);
calendar.add(calendar.DATE, -dates);
return str2Date(date2Str(calendar.getTime()));
}
/**
* Get the first day of last week (Monday)
*
* @param date
* @return
* @throws Exception
*/
public static Date getLastWeekStart(Date date) {
Calendar calendar = Calendar.getInstance(TimeZone.getDefault());
calendar.setTime(date);
int i = calendar.get(calendar.DAY_OF_WEEK) - 1;
int startnum = 0;
if (i == 0) {
startnum = 7 + 6;
} else {
startnum = 7 + i - 1;
}
calendar.add(calendar.DATE, -startnum);
return str2Date(date2Str(calendar.getTime()));
}
/**
* Get the last day of last week (weekend)
*
* @param date
* @return
* @throws Exception
*/
public static Date getLastWeekEnd(Date date) {
Calendar calendar = Calendar.getInstance(TimeZone.getDefault());
calendar.setTime(date);
int i = calendar.get(calendar.DAY_OF_WEEK) - 1;
int endnum = 0;
if (i == 0) {
endnum = 7;
} else {
endnum = i;
}
calendar.add(calendar.DATE, -(endnum - 1));
return str2Date(date2Str(calendar.getTime()));
}
/**
* Get days based on year and month
* @param num month
* @param year
* @return
*/
public static int getday(int num,int year){
if(num==1 || num==3 || num==5 || num==7 || num==8 || num==10 || num==12){
return 31;
}else if(num==2){
//Judge whether it is a leap year
if(year%400==0 || (year%4==0 && year%100!=0)){
return 29;
}else{
return 28;
}
}else{
return 30;
}
}
/*
* Calculate how many days there are to the current date next month
*/
public static int getdaymis(Date time){
int year = Integer.parseInt(
new SimpleDateFormat(TIME_YEAR).format(time));//Year
int mm = Integer.parseInt(
new SimpleDateFormat(TIME_MONEN).format(time));//month
int dd = Integer.parseInt(
new SimpleDateFormat(TIME_DAY).format(time));//Day
//Get the total number of days in the current year and month
int sdd = getday(mm, year);
return sdd-dd;
}
/**
* Date number of seconds
* @param dateString
* @return
*/
public static long getTime(String dateString) {
long time = 0;
try {
Date ret = null;
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
ret = sdf.parse(dateString);
time = ret.getTime()/1000;
} catch (Exception e) {
}
return time;
}
/**
* Accurately calculate the time difference, accurate to the day
* @param fistill Start date
* @param nowtime end date
* @param type type is 1 and returns year, month and day (such as: 2 years, 3 months and 5 days) Otherwise, return the total number of days
* @return
*/
public static String patienage(Date fistill,Date nowtime,Integer type){
int fight = Integer.parseInt(
new SimpleDateFormat(TIME_YEAR).format(fistill));//First year
int fmm = Integer.parseInt(
new SimpleDateFormat(TIME_MONEN).format(fistill));//First month
int fdd = Integer.parseInt(
new SimpleDateFormat(TIME_DAY).format(fistill));//First date
int nyear = Integer.parseInt(
new SimpleDateFormat(TIME_YEAR).format(nowtime));//End year
int nmm = Integer.parseInt(
new SimpleDateFormat(TIME_MONEN).format(nowtime));//End month
int ndd = Integer.parseInt(
new SimpleDateFormat(TIME_DAY).format(nowtime));//End date
int cyber = nyear - fyear;
int cmmm = nmm - fmm;
int cdd = ndd - fdd;
int zyear = 0;
int zmm = 0;
int zdd = 0;
int countddd = 0; //Cumulative number of days in year, month and day
if(cdd<0){
if(cm<0){
zyear = cyear - 1;
zmm = (cmm + 12)-1;
int dd = getday(zmm,nyear-1);
zdd = dd + cdd;
countddd = zyear*365+zmm*30+zdd;
}else if(cmm==0){
zyear = cyear - 1;
zmm = 12-1;
int dd = getday(zmm,nyear-1);
zdd = dd + cdd;
countddd = zyear*365+zmm*30+zdd;
}else{
zyear = cinear;
zmm = cmmm - 1;
int dd = getday(zmm,nyear);
zdd = dd + cdd;
countddd = zyear*365+zmm*30+zdd;
}
}else if(cdd==0){
if(cm<0){
zyear = cyear - 1;
zmm = cmmm + 12;
zdd = 0;
countddd = zyear*365+zmm*30;
}else if(cmm==0){
zyear = cinear;
zmm = 0;
zdd = 0;
countddd = zyear*365+zmm*30;
}else{
zyear = cinear;
zmm = cmmm;
zdd = 0;
countddd = zyear*365+zmm*30;
}
}else{
if(cm<0){
zyear = cyear - 1;
zmm = cmmm + 12;
zdd = cdd;
countddd = zyear*365+zmm*30+zdd;
}else if(cmm==0){
zyear = cinear;
zmm = 0;
zdd = cdd;
countddd = zyear*365+zmm*30+zdd;
}else{
zyear = cinear;
zmm = cmmm;
zdd = cdd;
countddd = zyear*365+zmm*30+zdd;
}
}
String ptime = null;
if(zdd!=0){
if(zmm!=0){
if(zyear!=0){
ptime = zyear+"year"+zmm+"month"+"zero"+zdd+"day";
}else{
ptime = zmm+"month"+"zero"+zdd+"day";
}
}else{
if(zyear!=0){
ptime = zyear+"year"+"zero"+zdd+"day";
}else{
ptime = zdd+"day";
}
}
}else{
if(zmm!=0){
if(zyear!=0){
ptime = zyear+"year"+zmm+"month";
}else{
ptime = zmm+"month";
}
}else{
if(zyear!=0){
ptime = zyear+"year";
}else{
ptime = null;
}
}
}
if(type==1){
return ptime; //Return to year, month and day (such as: 2 years, 3 months and 5 days)
}else{
return String.valueOf(countddd); //Return the total number of days
}
}
/**
* Get the number of months
* @param year Year difference
* @param month difference
* @return
*/
public static int getCmm(Integer year,Integer month){
int zmm = 0;
if(month < 0){
zmm = (month + 12)+(year-1)*12;
}else if(month == 0){
zmm = year*12;
}else{
zmm = year*12+month;
}
return zmm;
}
/**
* Change the current time
*/
public static Date changeDate(String type, int value) {
Calendar calendar = Calendar.getInstance(TimeZone.getDefault());
if (type.equals("month")) {
calendar.set(Calendar.MONTH, calendar.get(Calendar.MONTH) + value);
} else if (type.equals("date")) {
calendar.set(Calendar.DATE, calendar.get(Calendar.DATE) + value);
}
return calendar.getTime();
}
/**
* Change time
*/
public static Date changeDate(Date date, String type, int value) {
if (date != null) {
// Calendar calendar = Calendar.getInstance(TimeZone.getDefault());
Calendar calendar = new GregorianCalendar();
calendar.setTime(date);
// Calendar calendar = Calendar.
if (type.equals("month")) {
calendar.set(Calendar.MONTH, calendar.get(Calendar.MONTH) + value);
} else if (type.equals("date")) {
calendar.set(Calendar.DATE, calendar.get(Calendar.DATE) + value);
} else if (type.endsWith("year")) {
calendar.set(Calendar.YEAR, calendar.get(Calendar.YEAR) + value);
}
return calendar.getTime();
}
return null;
}
/**
* haoxw Compare whether the time is between these two time points
*
* @param time1
* @param time2
* @return
*/
public static boolean checkTime(String time1, String time2) {
Calendar calendar = Calendar.getInstance();
Date date1 = calendar.getTime();
Date date11 = DateUtil.str2Date(DateUtil.date2Str(date1, "yyyy-MM-dd") + " " + time1);// Start time
Calendar c = Calendar.getInstance();
c.add(Calendar.DATE, 1);
Date date2 = c.getTime();
Date date22 = DateUtil.str2Date(DateUtil.date2Str(date2, "yyyy-MM-dd") + " " + time2);// Termination time
Calendar scalendar = Calendar.getInstance();
scalendar.setTime(date11);// Start time
Calendar elendar = Calendar.getInstance();
elendar.setTime(date22);// Termination time
Calendar calendarnow = Calendar.getInstance();
if (calendarnow.after(scalendar) && calendarnow.before(equalendar)) {
return true;
} else {
return false;
}
}
/**
* haoxw Compare whether the time is between these two time points
*
* @param date11
* @param date22
* @return
*/
public static boolean checkTime(Date date11, Date date22) {
Calendar scalendar = Calendar.getInstance();
scalendar.setTime(date11);// Start time
Calendar elendar = Calendar.getInstance();
elendar.setTime(date22);// Termination time
Calendar calendarnow = Calendar.getInstance();
if (calendarnow.after(scalendar) && calendarnow.before(equalendar)) {
return true;
} else {
return false;
}
}
public static boolean checkDate(String date1, String date2) {
Date date11 = DateUtil.str2Date(date1, "yyyy-MM-dd HH:mm:ss");// Start time
Date date22 = DateUtil.str2Date(date2, "yyyy-MM-dd HH:mm:ss");// Termination time
Calendar scalendar = Calendar.getInstance();
scalendar.setTime(date11);// Start time
Calendar elendar = Calendar.getInstance();
elendar.setTime(date22);// Termination time
Calendar calendarnow = Calendar.getInstance();
System.out.println(date11.toString());
System.out.println(date22.toString());
System.out.println(scalendar.toString());
System.out.println(elendar.toString());
System.out.println(calendarnow.toString());
if (calendarnow.after(scalendar) && calendarnow.before(equalendar)) {
return true;
} else {
return false;
}
}
/**
* Get the date before interval days
*
* @param interval
* @param starttime
* @param pattern
* @return
*/
public static Date getIntervalDate(String interval, Date starttime, String pattern) {
Calendar temp = Calendar.getInstance();
temp.setTime(starttime);
temp.add(temp.DATE, Integer.parseInt(interval));
SimpleDateFormat sdf = new SimpleDateFormat(pattern);
String shijian = sdf.format(temp.getTime());
return str2Date(shijian);
}
public static Date formatDate(Date date){
SimpleDateFormat bartDateFormat =
new SimpleDateFormat("yyyy-MM-dd");
System.out.println(bartDateFormat.format(date));
SimpleDateFormat bartDateFormat1 =new SimpleDateFormat("yyyy-MM-dd");
try {
Date date1 = bartDateFormat1.parse(bartDateFormat.format(date));
} catch (ParseException e) {
e.printStackTrace();
}
System.out.println(date.getTime());
return date;
}
public static void main(String arf[]) {
/*String time1 = "2009-05-07 19:20:00";
String time2 = "2009-05-08 19:30:00";
DateUtil d = new DateUtil();
System.out.println(d.checkDate(time1, time2));
System.out.println(d.date2Str(new Date()));*/
//System.out.println(d.getIntervalDate("-3", new Date(), DEFAULT_PATTERN));
Calendar calendar = Calendar.getInstance(TimeZone.getDefault());
System.out.println(calendar.toString());
System.out.println(DateUtil.str2Date("20090731","yyyyMMdd"));
System.out.println(DateUtil.getBeforeDate(new Date(),2));
System.out.println(DateUtil.DatePattern(new Date()));
SimpleDateFormat bartDateFormat =
new SimpleDateFormat("yyyy-MM-dd");
Date date = new Date();
System.out.println("date;"+bartDateFormat.format(date));
SimpleDateFormat bartDateFormat1 =new SimpleDateFormat("yyyy-MM-dd");
try {
Date date1 = bartDateFormat1.parse(bartDateFormat.format(date));
System.out.println("Date:"+date1);
} catch (ParseException e) {
e.printStackTrace();
}
}
}