时间操作工具类
在项目开发工程中，使用了很多时间的操作，改工具类提供了很多方法
public class DateUtils {
public static final long DAY_IN_MILLISECOND = 24 * 60 * 60 * 1000;
public static Date addDay(Date date,int day){
return org.apache.commons.lang.time.DateUtils.addDays(date, day);
}
public static Date addWeek(Date date,int week){
return org.apache.commons.lang.time.DateUtils.addWeeks(date, week);
}
public static Date addMonth(Date date,int month){
return org.apache.commons.lang.time.DateUtils.addMonths(date, month);
}
public static Date getDate(Date date) {
return parseDate(format(date, "yyyyMMdd"), "yyyyMMdd");
}
public static Date addTime(Date date, int hours, int mins, int seconds) {
Date d = org.apache.commons.lang.time.DateUtils.addHours(date, hours);
d = org.apache.commons.lang.time.DateUtils.addMinutes(d, mins);
return org.apache.commons.lang.time.DateUtils.addSeconds(d, seconds);
}
public static Date getPreMonthDate(Date date)
{
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
int month = calendar.get(Calendar.MONTH);
calendar.set(Calendar.MONTH,month-1);
return calendar.getTime();
}
public static Date getPreYearDate(Date date)
{
Calendar calendar=Calendar.getInstance();
calendar.setTime(date);
int year=calendar.get(Calendar.YEAR);
calendar.set(Calendar.YEAR,year-1);
return calendar.getTime();
}
public static int get(Date date, int field) {
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.get(field);
}
/**
*
* @param date
* @param pattern
* @return
*/
public static Date parseDate(String dateString, String pattern) {
try {
return org.apache.commons.lang.time.DateUtils.parseDate(
dateString, new String[] { pattern });
} catch (ParseException e) {
return null;
}
}
/**
*
* @param date
* @param patterns
* @return
*/
public static Date parseDate(String dateString, String[] patterns) {
try {
return org.apache.commons.lang.time.DateUtils.parseDate(dateString, patterns);
} catch (ParseException e) {
return null;
}
}
/**
*
* @param year
* @param month
* @param date
* @return
*/
public static Date newDate(int year, int month, int date) {
return parseDate("" + year + month + date, month >= 10 ? "yyyyMMdd" : "yyyyMdd");
}
/**
*
* @param year
* @param month
* @param date
* @return
*/
public static String format(int year, int month, int date, String pattern) {
return DateFormatUtils.format(newDate(year, month, date), pattern);
}
/**
*
* @param date
* @return
*/
public static String format(Date date) {
return format(date,"yyyy-MM-dd");
}
/**
*
* @param date
* @return
*/
public static String format(Date date,String pattern) {
return DateFormatUtils.format(date, pattern);
}
/**
* compare the two dates, and return the subtraction between d1 and d2(d1 - d2)
* result > 0 when d1 > d2 and result < 0 when d1 < d2
*
* @param d1
* Date
* @param d2
* Date
* @return int
*/
public static int compareDateOnDay(Date d1, Date d2) {
if(d1.getTime() == d2.getTime())
return 0;
d1 = org.apache.commons.lang.time.DateUtils.truncate(d1, Calendar.DATE);
d2 = org.apache.commons.lang.time.DateUtils.truncate(d2, Calendar.DATE);
long l1 = d1.getTime();
long l2 = d2.getTime();
return (int) ((l1 - l2)/DAY_IN_MILLISECOND);
}
/**
* compare the two dates, and return the subtraction between the dates' month
* always return > 0
*
* @param d1
* Date
* @param d2
* Date
* @return int
*/
public static int compareDateOnMonth(Date d1, Date d2) {
if (d1.getTime() == d2.getTime()) {
return 0;
}
int flag = -1;
// compare the dates, and put the smaller before
if (d1.getTime() > d2.getTime()) {
Date temp = d1;
d1 = d2;
d2 = temp;
flag = 1;
}
Calendar c1 = Calendar.getInstance();
Calendar c2 = Calendar.getInstance();
c1.setTime(d1);
c2.setTime(d2);
int y1 = c1.get(Calendar.YEAR);
int y2 = c2.get(Calendar.YEAR);
int month1 = c1.get(Calendar.MONTH);
int month2 = c2.get(Calendar.MONTH);
int months = 0;
if(y1==y2){
months = month2-month1;
}else{
months = (y2-y1-1)*12+ (12-month1)+month2;
}
return months * flag;
}
/**
* judge the year whether is leap year
*
* @param year
* int year
* @return boolean
*/
public static boolean isLeapYear(int year) {
if ((year % 400 == 0) || ((year % 4 == 0) && (year % 100 != 0))) {
return true;
}
return false;
}
/**
* return the days of the year gevin
*
* @param year
* int year
* @return int
*/
public static int getYearDays(int year) {
if (isLeapYear(year)) {
return 366;
}
return 365;
}
/**
* judge whether the two dates are in same day
*
* @param date1
* @param date2
* @return
*/
public static boolean isSameDay(Date date1, Date date2) {
return org.apache.commons.lang.time.DateUtils.isSameDay(date1, date2);
}
public static Date truncate(Date d, int field) {
return org.apache.commons.lang.time.DateUtils.truncate(d, field);
}
public static boolean isLastDayOfMonth(Date date) {
return isFirstDayOfMonth(addDay(date, 1));
}
public static boolean isFirstDayOfMonth(Date date) {
return get(date, Calendar.DAY_OF_MONTH) == 1;
}
//add
public static Date getLastMonthDay(int year, int month) {
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.YEAR,year);
calendar.set(Calendar.MONTH,month - 1);
calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
return calendar.getTime();
}
public static Date getLastMonthDay(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
return calendar.getTime();
}
public static Date getFirstMonthDay(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.set(Calendar.DAY_OF_MONTH, 1);
return calendar.getTime();
}
public static Date getFirstMonthDay(int year, int month) {
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.YEAR,year);
calendar.set(Calendar.MONTH,month - 1);
calendar.set(Calendar.DAY_OF_MONTH, 1);
return calendar.getTime();
}
public static Date getFirstWeekDay(int year, int week) {
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.YEAR,year);
calendar.set(Calendar.WEEK_OF_YEAR, week);
calendar.set(calendar.DAY_OF_WEEK,1);
return addDay(calendar.getTime(), 1);
}
public static Date getFirstWeekDay(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.set(calendar.DAY_OF_WEEK,1);
return addDay(calendar.getTime(), 1);
}
public static Date getLastWeekDay(int year, int week) {
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.YEAR,year);
calendar.set(Calendar.WEEK_OF_YEAR, week);
calendar.set(calendar.DAY_OF_WEEK,7);
return addDay(calendar.getTime(), 1);
}
public static Date getLastWeekDay(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.set(calendar.DAY_OF_WEEK,7);
return addDay(calendar.getTime(), 1);
}
public static int getWeek(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setFirstDayOfWeek(Calendar.MONDAY);
calendar.setTime(date);
return calendar.get(Calendar.WEEK_OF_YEAR);
}
public static int getMonth(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
return calendar.get(Calendar.MONTH)+1;
}
public static int getYear(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
return calendar.get(Calendar.YEAR);
}
public static int getInterval(Date d1, Date d2) {
int betweenDays = 0;
Calendar c1 = Calendar.getInstance();
Calendar c2 = Calendar.getInstance();
c1.setTime(d1);
c2.setTime(d2);
// 保证第二个时间一定大于第一个时间
if(c1.after(c2)){
c1 = c2;
c2.setTime(d1);
}
int betweenYears = c2.get(Calendar.YEAR)-c1.get(Calendar.YEAR);
betweenDays = c2.get(Calendar.DAY_OF_YEAR)-c1.get(Calendar.DAY_OF_YEAR);
for(int i=0;i<betweenYears;i++){
c1.set(Calendar.YEAR,(c1.get(Calendar.YEAR)+1));
betweenDays += c1.getMaximum(Calendar.DAY_OF_YEAR);
}
return betweenDays;
}
public static List<Date> getDateList(Date startDate, Date endDate) {
List<Date> dates = new ArrayList<Date>();
int betweenDays = DateUtils.getInterval(startDate, endDate);
for (int i = 0; i <= betweenDays; i++) {
Date day = DateUtils.addDay(startDate, i);
if (day.getTime() >= startDate.getTime() && day.getTime() <= endDate.getTime()) {
dates.add(day);
}
}
return dates;
}
public static int getMonthInterval(Date startDate, Date endDate) {
int betweenMonths = 0;
Calendar c1 = Calendar.getInstance();
Calendar c2 = Calendar.getInstance();
c1.setTime(startDate);
c2.setTime(endDate);
// 保证第二个时间一定大于第一个时间
if(c1.after(c2)){
c1 = c2;
c2.setTime(startDate);
}
int y1 = c1.get(Calendar.YEAR);
int y2 = c2.get(Calendar.YEAR);
int m1 = c1.get(Calendar.MONTH);
int m2 = c2.get(Calendar.MONTH);
if (y2 > y1) {
betweenMonths += (y2 - y1) * 12;
}
betweenMonths += (m2 - m1);
return betweenMonths;
}
public static int getWeekInterval(Date startDate, Date endDate) {
int betweenWeeks = 0;
Calendar c1 = Calendar.getInstance();
Calendar c2 = Calendar.getInstance();
c1.setTime(startDate);
c2.setTime(endDate);
// 保证第二个时间一定大于第一个时间
if(c1.after(c2)){
c1 = c2;
c2.setTime(startDate);
}
int y1 = c1.get(Calendar.YEAR);
int y2 = c2.get(Calendar.YEAR);
int w1 = c1.get(Calendar.WEEK_OF_YEAR);
int w2 = c2.get(Calendar.WEEK_OF_YEAR);
betweenWeeks += (w2 - w1);
int betweenYears = y2 - y1;
for (int i = 0; i < betweenYears; i++) {
c1.set(Calendar.YEAR,(c1.get(Calendar.YEAR)+1));
betweenWeeks += c1.getMaximum(Calendar.WEEK_OF_YEAR);
}
return betweenWeeks;
}