package cn.knet.data.untils; import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar; /**
* yyyy-MM-dd HH:mm:ss
* @author zhaoyb
*
*/
public class DateUtil { /**
* 把日期字符串格式化成日期类型
* @param dateStr
* @param format
* @return
*/
public static Date convert2Date(String dateStr, String format) {
SimpleDateFormat simple = new SimpleDateFormat(format);
try {
simple.setLenient(false);
return simple.parse(dateStr);
} catch (Exception e) {
return null;
}
} /**
* 把日期类型格式化成字符串
* @param date
* @param format
* @return
*/
public static String convert2String(Date date, String format) {
SimpleDateFormat formater = new SimpleDateFormat(format);
try {
return formater.format(date);
} catch (Exception e) {
return null;
}
} /**
* 转sql的time格式
* @param date
* @return
*/
public static java.sql.Timestamp convertSqlTime(Date date){
java.sql.Timestamp timestamp = new java.sql.Timestamp(date.getTime());
return timestamp;
} /**
* 转sql的日期格式
* @param date
* @return
*/
public static java.sql.Date convertSqlDate(Date date){
java.sql.Date Datetamp = new java.sql.Date(date.getTime());
return Datetamp;
} /**
* 获取当前日期
* @param format
* @return
*/
public static String getCurrentDate(String format) {
return new SimpleDateFormat(format).format(new Date());
} /**
* 获取时间戳
* @return
*/
public static long getTimestamp()
{
return System.currentTimeMillis();
} /**
* 获取月份的天数
* @param year
* @param month
* @return
*/
public static int getDaysOfMonth(int year, int month) {
Calendar calendar = Calendar.getInstance();
calendar.set(year, month - 1, 1);
return calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
} /**
* 获取日期的年
* @param date
* @return
*/
public static int getYear(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
return calendar.get(Calendar.YEAR);
} /**
* 获取日期的月
* @param date
* @return
*/
public static int getMonth(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
return calendar.get(Calendar.MONTH) + 1;
} /**
* 获取日期的日
* @param date
* @return
*/
public static int getDay(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
return calendar.get(Calendar.DATE);
} /**
* 获取日期的时
* @param date
* @return
*/
public static int getHour(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
return calendar.get(Calendar.HOUR);
} /**
* 获取日期的分种
* @param date
* @return
*/
public static int getMinute(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
return calendar.get(Calendar.MINUTE);
} /**
* 获取日期的秒
* @param date
* @return
*/
public static int getSecond(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
return calendar.get(Calendar.SECOND);
} /**
* 获取星期几
* @param date
* @return
*/
public static int getWeekDay(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
return dayOfWeek-1;
} /**
* 获取哪一年共有多少周
* @param year
* @return
*/
public static int getMaxWeekNumOfYear(int year) {
Calendar c = new GregorianCalendar();
c.set(year, Calendar.DECEMBER, 31, 23, 59, 59);
return getWeekNumOfYear(c.getTime());
} /**
* 取得某天是一年中的多少周
* @param date
* @return
*/
public static int getWeekNumOfYear(Date date) {
Calendar c = new GregorianCalendar();
c.setFirstDayOfWeek(Calendar.MONDAY);
c.setMinimalDaysInFirstWeek(7);
c.setTime(date);
return c.get(Calendar.WEEK_OF_YEAR);
} /**
* 取得某天所在周的第一天
* @param year
* @return
*/
public static Date getFirstDayOfWeek(Date date) {
Calendar c = new GregorianCalendar();
c.setFirstDayOfWeek(Calendar.MONDAY);
c.setTime(date);
c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek());
return c.getTime();
} /**
* 取得某天所在周的最后一天
* @param date
* @return
*/
public static Date getLastDayOfWeek(Date date) {
Calendar c = new GregorianCalendar();
c.setFirstDayOfWeek(Calendar.MONDAY);
c.setTime(date);
c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek() + 6);
return c.getTime();
} /**
* 取得某年某周的第一天 对于交叉:2008-12-29到2009-01-04属于2008年的最后一周,2009-01-05为2009年第一周的第一天
* @param year
* @param week
* @return
*/
public static Date getFirstDayOfWeek(int year, int week) {
Calendar calFirst = Calendar.getInstance();
calFirst.set(year, 0, 7);
Date firstDate = getFirstDayOfWeek(calFirst.getTime()); Calendar firstDateCal = Calendar.getInstance();
firstDateCal.setTime(firstDate); Calendar c = new GregorianCalendar();
c.set(Calendar.YEAR, year);
c.set(Calendar.MONTH, Calendar.JANUARY);
c.set(Calendar.DATE, firstDateCal.get(Calendar.DATE)); Calendar cal = (GregorianCalendar) c.clone();
cal.add(Calendar.DATE, (week - 1) * 7);
firstDate = getFirstDayOfWeek(cal.getTime()); return firstDate;
} /**
* 取得某年某周的最后一天 对于交叉:2008-12-29到2009-01-04属于2008年的最后一周, 2009-01-04为
* 2008年最后一周的最后一天
* @param year
* @param week
* @return
*/
public static Date getLastDayOfWeek(int year, int week) {
Calendar calLast = Calendar.getInstance();
calLast.set(year, 0, 7);
Date firstDate = getLastDayOfWeek(calLast.getTime()); Calendar firstDateCal = Calendar.getInstance();
firstDateCal.setTime(firstDate); Calendar c = new GregorianCalendar();
c.set(Calendar.YEAR, year);
c.set(Calendar.MONTH, Calendar.JANUARY);
c.set(Calendar.DATE, firstDateCal.get(Calendar.DATE)); Calendar cal = (GregorianCalendar) c.clone();
cal.add(Calendar.DATE, (week - 1) * 7);
Date lastDate = getLastDayOfWeek(cal.getTime()); return lastDate;
} private static Date add(Date date, int calendarField, int amount) {
if (date == null) {
throw new IllegalArgumentException("The date must not be null");
} else {
Calendar c = Calendar.getInstance();
c.setTime(date);
c.add(calendarField, amount);
return c.getTime();
}
} /*
* 1则代表的是对年份操作， 2是对月份操作， 3是对星期操作， 5是对日期操作， 11是对小时操作， 12是对分钟操作， 13是对秒操作，
* 14是对毫秒操作
*/ /**
* 增加年
* @param date
* @param amount
* @return
*/
public static Date addYears(Date date, int amount) {
return add(date, 1, amount);
} /**
* 增加月
* @param date
* @param amount
* @return
*/
public static Date addMonths(Date date, int amount) {
return add(date, 2, amount);
} /**
* 增加周
* @param date
* @param amount
* @return
*/
public static Date addWeeks(Date date, int amount) {
return add(date, 3, amount);
} /**
* 增加天
* @param date
* @param amount
* @return
*/
public static Date addDays(Date date, int amount) {
return add(date, 5, amount);
} /**
* 增加时
* @param date
* @param amount
* @return
*/
public static Date addHours(Date date, int amount) {
return add(date, 11, amount);
} /**
* 增加分
* @param date
* @param amount
* @return
*/
public static Date addMinutes(Date date, int amount) {
return add(date, 12, amount);
} /**
* 增加秒
* @param date
* @param amount
* @return
*/
public static Date addSeconds(Date date, int amount) {
return add(date, 13, amount);
} /**
* 增加毫秒
* @param date
* @param amount
* @return
*/
public static Date addMilliseconds(Date date, int amount) {
return add(date, 14, amount);
} /**
* time差
* @param before
* @param after
* @return
*/
public static long diffTimes(Date before, Date after){
return after.getTime() - before.getTime();
} /**
* 秒差
* @param before
* @param after
* @return
*/
public static long diffSecond(Date before, Date after){
return (after.getTime() - before.getTime())/1000;
} /**
* 分种差
* @param before
* @param after
* @return
*/
public static int diffMinute(Date before, Date after){
return (int)(after.getTime() - before.getTime())/1000/60;
} /**
* 时差
* @param before
* @param after
* @return
*/
public static int diffHour(Date before, Date after){
return (int)(after.getTime() - before.getTime())/1000/60/60;
} /**
* 天数差
* @param date1
* @param date2
* @return
*/
public static int diffDay(Date before, Date after) {
return Integer.parseInt(String.valueOf(((after.getTime() - before.getTime()) / 86400000)));
} /**
* 月差
* @param before
* @param after
* @return
*/
public static int diffMonth(Date before, Date after){
int monthAll=0;
int yearsX = diffYear(before,after);
Calendar c1 = Calendar.getInstance();
Calendar c2 = Calendar.getInstance();
c1.setTime(before);
c2.setTime(after);
int monthsX = c2.get(Calendar.MONTH) - c1.get(Calendar.MONTH);
monthAll=yearsX*12+monthsX;
int daysX =c2.get(Calendar.DATE) - c1.get(Calendar.DATE);
if(daysX>0){
monthAll=monthAll+1;
}
return monthAll;
} /**
* 年差
* @param before
* @param after
* @return
*/
public static int diffYear(Date before, Date after) {
return getYear(after) - getYear(before);
} /**
* 设置23:59:59
* @param date
* @return
*/
public static Date setEndDay(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.set(Calendar.HOUR_OF_DAY, 23);
calendar.set(Calendar.MINUTE, 59);
calendar.set(Calendar.SECOND, 59);
return calendar.getTime();
} /**
* 设置00:00:00
* @param date
* @return
*/
public static Date setStartDay(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.set(Calendar.HOUR_OF_DAY, 00);
calendar.set(Calendar.MINUTE, 00);
calendar.set(Calendar.SECOND, 00);
return calendar.getTime();
} }