java日期工具类

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本文介绍了一个实用的日期操作工具类，提供了多种日期处理方法，如获取当天、昨天、本周、本月及本年的起止时间等。同时，还包含了计算年龄、格式化日期等功能。
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import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;

/**
 * 
 */
public class CommonDateUtil {

    /**
     * 当天的开始时间
     * @return
     */
    public static Date startOfTodDay() {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MILLISECOND, 0);
        Date date=calendar.getTime();
        return date;
    }
    /**
     * 当天的结束时间
     * @return
     */
    public static Date endOfTodDay() {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.HOUR_OF_DAY, 23);
        calendar.set(Calendar.MINUTE, 59);
        calendar.set(Calendar.SECOND, 59);
        Date date=calendar.getTime();
        return date;
    }
    /**
     * 昨天的开始时间
     * @return
     */
    public static long startOfyesterday() {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.add(Calendar.DATE, -1);
        calendar.set(Calendar.MILLISECOND, 0);
        Date date=calendar.getTime();
        return date.getTime();
    }
    /**
     * 昨天的结束时间
     * @return
     */
    public static long endOfyesterday() {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.HOUR_OF_DAY, 23);
        calendar.set(Calendar.MINUTE, 59);
        calendar.set(Calendar.SECOND, 59);
        calendar.set(Calendar.MILLISECOND, 999);
        calendar.add(Calendar.DATE, -1);
        Date date=calendar.getTime();
        return date.getTime();
    }
    /**
     * 功能：获取上周的开始时间
     */
    public static long startOfLastWeek() {// 当周开始时间
        return startOfThisWeek().getTime() - 7 * 24 * 60 * 60 * 1000;
    }
    /**
     * 功能：获取上周的结束时间
     */
    public static long endOfLastWeek() {// 当周开始时间
        return endOfThisWeek() - 7 * 24 * 60 * 60 * 1000;
    }
    /**
     * 功能：获取本周的开始时间 示例：2013-05-13 00:00:00
     */
    public static Date startOfThisWeek() {// 当周开始时间
        Calendar currentDate = Calendar.getInstance();
        currentDate.setFirstDayOfWeek(Calendar.MONDAY);
        currentDate.set(Calendar.HOUR_OF_DAY, 0);
        currentDate.set(Calendar.MINUTE, 0);
        currentDate.set(Calendar.SECOND, 0);
        currentDate.set(Calendar.MILLISECOND, 0);
        currentDate.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
        return currentDate.getTime();
    }
    /**
     * 功能：获取本周的结束时间 示例：2013-05-19 23:59:59
     */
    public static long endOfThisWeek() {// 当周结束时间
        Calendar currentDate = Calendar.getInstance();
        currentDate.setFirstDayOfWeek(Calendar.MONDAY);
        currentDate.set(Calendar.HOUR_OF_DAY, 23);
        currentDate.set(Calendar.MINUTE, 59);
        currentDate.set(Calendar.SECOND, 59);
        currentDate.set(Calendar.MILLISECOND, 999);
        currentDate.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
        Date date=currentDate.getTime();
        return date.getTime();
    }
    /**
     * 功能：获取本月的开始时间
     */
    public static Date startOfThisMonth() {// 当周开始时间
        Calendar currentDate = Calendar.getInstance();
        currentDate.set(Calendar.HOUR_OF_DAY, 0);
        currentDate.set(Calendar.MINUTE, 0);
        currentDate.set(Calendar.SECOND, 0);
        currentDate.set(Calendar.MILLISECOND, 0);
        currentDate.set(Calendar.DAY_OF_MONTH, 1);
        Date date=currentDate.getTime();
        return date;
    }
    /**
     * 功能：获取本月的结束时间
     */
    public static Date endOfThisMonth() {
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.DAY_OF_MONTH, 1);
        cal.set(Calendar.HOUR_OF_DAY, 23);
        cal.set(Calendar.MINUTE, 59);
        cal.set(Calendar.SECOND, 59);
        cal.set(Calendar.MILLISECOND, 999);
        cal.add(Calendar.MONTH, 1);
        cal.add(Calendar.DATE, -1);
        Date date=cal.getTime();
        return date;
    }
    /**
     * 功能：获取上月的开始时间
     */
    public static Date startOfLastMonth() {// 当周开始时间
        Calendar currentDate = Calendar.getInstance();
        currentDate.set(Calendar.HOUR_OF_DAY, 0);
        currentDate.set(Calendar.MINUTE, 0);
        currentDate.set(Calendar.SECOND, 0);
        currentDate.set(Calendar.MILLISECOND, 0);
        currentDate.set(Calendar.DAY_OF_MONTH, 1);
        currentDate.add(Calendar.MONTH, -1);
        return currentDate.getTime();
    }
    /**
     * 功能：获取上月的结束时间
     */
    public static long endOfLastMonth() {
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.DAY_OF_MONTH, 1);
        cal.set(Calendar.HOUR_OF_DAY, 23);
        cal.set(Calendar.MINUTE, 59);
        cal.set(Calendar.SECOND, 59);
        cal.set(Calendar.MILLISECOND, 999);
        cal.add(Calendar.DATE, -1);
        Date date=cal.getTime();
        return date.getTime();
    }
    /**
     * 功能：获取本年的开始时间
     */
    public static Date startOfTheYear() {// 当周开始时间
        Calendar currentDate = Calendar.getInstance();
        currentDate.set(Calendar.YEAR, currentDate.get(Calendar.YEAR));
        currentDate.set(Calendar.MONTH, 0);
        currentDate.set(Calendar.HOUR_OF_DAY, 0);
        currentDate.set(Calendar.MINUTE, 0);
        currentDate.set(Calendar.SECOND, 0);
        currentDate.set(Calendar.MILLISECOND, 0);
        currentDate.set(Calendar.DAY_OF_MONTH, 1);
        Date date=currentDate.getTime();
        return date;
    }


    /**
     * 功能：获取本年的开始时间
     */

    public static Date endOfTheYear() {
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR,cal.get(Calendar.YEAR));
        cal.set(Calendar.MONTH,11);
        cal.set(Calendar.DAY_OF_MONTH, 31);
        cal.set(Calendar.HOUR_OF_DAY, 23);
        cal.set(Calendar.MINUTE, 59);
        cal.set(Calendar.SECOND, 59);
        cal.set(Calendar.MILLISECOND, 999);
        Date date=cal.getTime();
        return date;
    }


    /**
     * 最近几天的开始
     * @param someDays
     * @return
     */
    public static Date startOfLastSomeDays(Integer someDays) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.add(Calendar.DATE, -someDays);
        calendar.set(Calendar.MILLISECOND, 0);
        return calendar.getTime();
    }

    /**
     * 某天的结束
     * @param date
     * @return
     */
    public static Date endOfOneDay(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.clear();
        calendar.setTime(date);
        calendar.set(Calendar.HOUR_OF_DAY, 23);
        calendar.set(Calendar.MINUTE, 59);
        calendar.set(Calendar.SECOND, 59);
        calendar.set(Calendar.MILLISECOND, 0);
        return calendar.getTime();
    }

    /**
     * 通过生日计算年龄
     * @param birthday
     * @return
     */
    public static Long getAge(Date birthday) {
        long birthdayTime = birthday.getTime();
        long localTime = new Date().getTime();
        long day = ((localTime - birthdayTime) / (24 * 60 * 60 * 1000)) + 1;
        return day / 360;
    }



    public static String formatDate(Date date , String format){
        return new SimpleDateFormat(format).format(date);
    }

    /**
     * 获取某一时间段特定星期几的日期
     *
     * @param dateFrom 开始时间
     * @param dateEnd  结束时间
     * @return 返回时间数组
     */

    public static String[] getDates(String dateFrom, String dateEnd) {
        String weekDays = "星期一|星期二|星期三|星期四|星期五|星期六|星期日";
        long time = 1;
        long perDayMilSec = 24 * 60 * 60 * 1000;
        List<String> dateList = new ArrayList<String>();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        //需要查询的星期系数
        String strWeekNumber = weekForNum(weekDays);
        try {
            dateFrom = sdf.format(sdf.parse(dateFrom).getTime() - perDayMilSec);
            while (true) {
                time = sdf.parse(dateFrom).getTime();
                time = time + perDayMilSec;
                Date date = new Date(time);
                dateFrom = sdf.format(date);
                if (dateFrom.compareTo(dateEnd) <= 0) {
                    //查询的某一时间的星期系数
                    Integer weekDay = dayForWeek(date);
                    //判断当期日期的星期系数是否是需要查询的
                    if (strWeekNumber.indexOf(weekDay.toString()) != -1) {
                        dateList.add(dateFrom);
                    }
                } else {
                    break;
                }
            }
        } catch (ParseException e1) {
            e1.printStackTrace();
        }
        String[] dateArray = new String[dateList.size()];
        dateList.toArray(dateArray);
        return dateArray;
    }

    //等到当期时间的周系数。星期日：1，星期一：2，星期二：3，星期三：4，星期四：5，星期五：6，星期六：7
    public static Integer dayForWeek(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        return calendar.get(Calendar.DAY_OF_WEEK);
    }

    /**
     * 得到对应星期的系数  星期日：1，星期一：2，星期二：3，星期三：4，星期四：5，星期五：6，星期六：7
     *
     * @param weekDays 星期格式  星期一|星期二
     */
    public static String weekForNum(String weekDays) {
        //返回结果为组合的星期系数
        String weekNumber = "";
        //解析传入的星期
        if (weekDays.indexOf("|") != -1) {//多个星期数
            String[] strWeeks = weekDays.split("\\|");
            for (int i = 0; i < strWeeks.length; i++) {
                weekNumber = weekNumber + "" + getWeekNum(strWeeks[i]).toString();
            }
        } else {//一个星期数
            weekNumber = getWeekNum(weekDays).toString();
        }

        return weekNumber;

    }


    //将星期转换为对应的系数  星期日：1，星期一：2，星期二：3，星期三：4，星期四：5，星期五：6，星期六：7
    public static Integer getWeekNum(String strWeek) {
        Integer number = 1;//默认为星期日
        if ("星期日".equals(strWeek)) {
            number = 1;
        } else if ("星期一".equals(strWeek)) {
            number = 2;
        } else if ("星期二".equals(strWeek)) {
            number = 3;
        } else if ("星期三".equals(strWeek)) {
            number = 4;
        } else if ("星期四".equals(strWeek)) {
            number = 5;
        } else if ("星期五".equals(strWeek)) {
            number = 6;
        } else if ("星期六".equals(strWeek)) {
            number = 7;
        } else {
            number = 1;
        }
        return number;
    }
}