Java工具类DateUtils实例详解

Java工具类DateUtils实例详解

本文实例为大家分享了java工具类DateUtils的具体代码，供大家参考，具体内容如下

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

/**

* 描述:公共日期工具类

*/

public class DateUtils {

public static String DATE_FORMAT = "yyyy-MM-dd";

public static String DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm:ss";

public static String DATE_FORMAT_CHINESE = "yyyy年M月d日";

/**

* 获取当前日期

*

*

* @return

*

*/

public static String getCurrentDate() {

String datestr = null;

SimpleDateFormat df = new SimpleDateFormat(DateUtils.DATE_FORMAT);

datestr = df.format(new Date());

return datestr;

}

/**

* 获取当前日期时间

*

*

* @return

*

*/

public static String getCurrentDateTime() {

String datestr = null;

SimpleDateFormat df = new SimpleDateFormat(DateUtils.DATE_TIME_FORMAT);

datestr = df.format(new Date());

return datestr;

}

/**

* 获取当前日期时间

*

*

* @return

*

*/

public static String getCurrentDateTime(String Dateformat) {

String datestr = null;

SimpleDateFormat df = new SimpleDateFormat(Dateformat);

datestr = df.format(new Date());

return datestr;

}

public static String dateToDateTime(Date date) {

String datestr = null;

SimpleDateFormat df = new SimpleDateFormat(DateUtils.DATE_TIME_FORMAT);

datestr = df.format(date);

return datestr;

}

/**

* 将字符串日期转换为日期格式

*

*

* @param datestr

* @return

*

*/

public static Date stringToDate(String datestr) {

if(datestr ==null ||datestr.equals("")){

return null;

}

Date date = new Date();

SimpleDateFormat df = new SimpleDateFormat(DateUtils.DATE_FORMAT);

try {

date = df.parse(datestr);

} catch (ParseException e) {

date=DateUtils.stringToDate(datestr,"yyyyMMdd");

}

return date;

}

/**

* 将字符串日期转换为日期格式

* 自定義格式

*

* @param datestr

* @return

*

*/

public static Date stringToDate(String datestr, String dateformat) {

Date date = new Date();

SimpleDateFormat df = new SimpleDateFormat(dateformat);

try {

date = df.parse(datestr);

} catch (ParseException e) {

e.printStackTrace();

}

return date;

}

/**

* 将日期格式日期转换为字符串格式

*

*

* @param date

* @return

*

*/

public static String dateToString(Date date) {

String datestr = null;

SimpleDateFormat df = new SimpleDateFormat(DateUtils.DATE_FORMAT);

datestr = df.format(date);

return datestr;

}

/**

* 将日期格式日期转换为字符串格式 自定義格式

*

* @param date

* @param dateformat

* @return

*/

public static String dateToString(Date date, String dateformat) {

String datestr = null;

SimpleDateFormat df = new SimpleDateFormat(dateformat);

datestr = df.format(date);

return datestr;

}

/**

* 获取日期的DAY值

*

*

* @param date

* 输入日期

* @return

*

*/

public static int getDayOfDate(Date date) {

int d = 0;

Calendar cd = Calendar.getInstance();

cd.setTime(date);

d = cd.get(Calendar.DAY_OF_MONTH);

return d;

}

/**

* 获取日期的MONTH值

*

*

* @param date

* 输入日期

* @return

*

*/

public static int getMonthOfDate(Date date) {

int m = 0;

Calendar cd = Calendar.getInstance();

cd.setTime(date);

m = cd.get(Calendar.MONTH) + 1;

return m;

}

/**

* 获取日期的YEAR值

*

*

* @param date

* 输入日期

* @return

*

*/

public static int getYearOfDate(Date date) {

int y = 0;

Calendar cd = Calendar.getInstance();

cd.setTime(date);

y = cd.get(Calendar.YEAR);

return y;

}

/**

* 获取星期几

*

*

* @param date

* 输入日期

* @return

*

*/

public static int getWeekOfDate(Date date) {

int wd = 0;

Calendar cd = Calendar.getInstance();

cd.setTime(date);

wd = cd.get(Calendar.DAY_OF_WEEK) - 1;

return wd;

}

/**

* 获取输入日期的当月第一天

*

*

* @param date

* 输入日期

* @return

*

*/

public static Date getFirstDayOfMonth(Date date) {

Calendar cd = Calendar.getInstance();

cd.setTime(date);

cd.set(Calendar.DAY_OF_MONTH, 1);

return cd.getTime();

}

/**

* 获得输入日期的当月最后一天

*

* @param date

*/

public static Date getLastDayOfMonth(Date date) {

return DateUtils.addDay(DateUtils.getFirstDayOfMonth(DateUtils.addMonth(date, 1)), -1);

}

/**

* 判断是否是闰年

*

*

* @param date

* 输入日期

* @return 是true 否false

*

*/

public static boolean isLeapYEAR(Date date) {

Calendar cd = Calendar.getInstance();

cd.setTime(date);

int year = cd.get(Calendar.YEAR);

if (year % 4 == 0 && year % 100 != 0 | year % 400 == 0) {

return true;

} else {

return false;

}

}

/**

* 根据整型数表示的年月日，生成日期类型格式

*

* @param year

* 年

* @param month

* 月

* @param day

* 日

* @return

*

*/

public static Date getDateByYMD(int year, int month, int day) {

Calendar cd = Calendar.getInstance();

cd.set(year, month-1, day);

return cd.getTime();

}

/**

* 获取年周期对应日

*

* @param date

* 输入日期

* @param iyear

* 年数 負數表示之前

* @return

*

*/

public static Date getYearCycleOfDate(Date date, int iyear) {

Calendar cd = Calendar.getInstance();

cd.setTime(date);

cd.add(Calendar.YEAR, iyear);

return cd.getTime();

}

/**

* 获取月周期对应日

*

* @param date

* 输入日期

* @param i

* @return

*

*/

public static Date getMonthCycleOfDate(Date date, int i) {

Calendar cd = Calendar.getInstance();

cd.setTime(date);

cd.add(Calendar.MONTH, i);

return cd.getTime();

}

/**

* 计算 fromDate 到 toDate 相差多少年

*

* @param fromDate

* @param toDate

* @return 年数

*

*/

public static int getYearByMinusDate(Date fromDate, Date toDate) {

Calendar df=Calendar.getInstance();

df.setTime(fromDate);

Calendar dt=Calendar.getInstance();

dt.setTime(toDate);

return dt.get(Calendar.YEAR)-df.get(Calendar.YEAR);

}

/**

* 计算 fromDate 到 toDate 相差多少个月

*

* @param fromDate

* @param toDate

* @return 月数

*

*/

public static int getMonthByMinusDate(Date fromDate, Date toDate) {

Calendar df=Calendar.getInstance();

df.setTime(fromDate);

Calendar dt=Calendar.getInstance();

dt.setTime(toDate);

return dt.get(Calendar.YEAR)*12+dt.get(Calendar.MONTH)-

(df.get(Calendar.YEAR)*12+df.get(Calendar.MONTH));

}

/**

* 计算 fromDate 到 toDate 相差多少天

*

* @param fromDate

* @param toDate

* @return 天数

*

*/

public sthttp://atic long getDayByMinusDate(Object fromDate, Object toDate) {

Date f=DateUtils.chgObject(fromDate);

Date t=DateUtils.chgObject(toDate);

long fd=f.getTime();

long td=t.getTime();

return (td-fd)/(24L * 60L * 60L * 1000L);

}

/**

* 计算年龄

*

* @param birthday

* 生日日期

* @param calcDate

* 要计算的日期点

* @return

*

*/

public static int calcAge(Date birthday, Date calcDate) {

int cYear=DateUtils.getYearOfDate(calcDate);

int cMonth=DateUtils.getMonthOfDate(calcDate);

int cDay=DateUtils.getDayOfDate(calcDate);

int bYear=DateUtils.getYearOfDate(birthday);

int bMonth=DateUtils.getMonthOfDate(birthday);

int bDay=DateUtils.getDayOfDate(birthday);

if(cMonth>bMonth||(cMonth==bMonth&&cDay>bDay)){

return cYear-bYear;

}else{

return cYear-1-bYear;

}

}

/**

* 从身份证中获取出生日期

*

* @param idno

* 身份证号码

* @return

*

*/

public static String getBirthDayFromIDCard(String idno) {

Calendar cd = Calendar.getInstance();

if (idno.length() == 15) {

cd.set(Calendar.YEAR, Integer.valueOf("19" + idno.substring(6, 8))

.intValue());

cd.set(Calendar.MONTH, Integer.valueOf(idno.substring(8, 10))

.intValue() - 1);

cd.set(Calendar.DAY_OF_MONTH,

Integer.valueOf(idno.substring(10, 12)).intValue());

} else if (idno.length() == 18) {

cd.set(Calendar.YEAR, Integer.valueOf(idno.substring(6, 10))

.intValue());

cd.set(Calendar.MONTH, Integer.valueOf(idno.substring(10, 12))

.intValue() - 1);

cd.set(Calendar.DAY_OF_MONTH,

Integer.valueOf(idno.substring(12, 14)).intValue());

}

return DateUtils.dateToString(cd.getTime());

}

/**

* 在输入日期上增加（+）或减去（-）天数

*

* @param date

* 输入日期

* @param imonth

* 要增加或减少的天数

*/

public static Date addDay(Date date, int iday) {

Calendar cd = Calendar.getInstance();

cd.setTime(date);

cd.add(Calendar.DAY_OF_MONTH, iday);

return cd.getTime();

}

/**

* 在输入日期上增加（+）或减去（-）月份

*

* @param date

* 输入日期

* @param imonth

* 要增加或减少的月分数

*/

public static Date addMonth(Date date, int imonth) {

Calendar cd = Calendar.getInstance();

cd.setTime(date);

cd.add(Calendar.MONTH, imonth);

return cd.getTime();

}

/**

* 在输入日期上增加（+）或减去（-）年份

*

* @param date

* 输入日期

* @param imonth

* 要增加或减少的年数

*/

public static Date addYear(Date date, int iyear) {

Calendar cd = Calendar.getInstance();

cd.setTime(date);

cd.add(Calendar.YEAR, iyear);

return cd.getTime();

}

/**

* 將OBJECT類型轉換為Date

* @param date

* @return

*/

public static Date chgObject(Object date){

if(date!=null&&date instanceof Date){

return (Date)date;

}

if(date!=null&&date instanceof String){

return DateUtils.stringToDate((String)date);

}

return null;

}

public static long getAgeByBirthday(String date){

Date birthday = stringToDate(date, "yyyy-MM-dd");

long sec = new Date().getTime() - birthday.getTime();

long age = sec/(1000*60*60*24)/365;

return age;

}

/**

* @param args

*/

public static void main(String[] args) {

//String temp = DateUtil.dateToString(getLastDayOfMonth(new Date()),

/// DateUtil.DATE_FORMAT_CHINESE);

//String s=DateUtil.dateToString(DateUtil.addDay(DateUtil.addYear(new Date(),1),-1));

long s=DateUtils.getDayByMinusDate("2012-01-01", "2012-12-31");

System.err.println(s);

}

}

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