Java-DateUtils工具类

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 static 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);

    }

}