Java常用时间操作工具类

Java常用时间操作工具类

文章分类:Java编程

话不多说，下文是一个时间计算的工具类，提供了一些常用的时间计算方法，大家也可以自己在这个的基础上修改和扩展。希望对大家有一点点用处。

 

package www.;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.TimeZone;

/**
 * @author: Frank
 * @site: <a href="http://www.">名课堂企业管理培训网</a>
 * @company: http://www.
 * @blog: http://crazysheep./
 */
public class DateUtils {

    //http响应头Expire属性时间格式
    public static final String HTTP_RESPONSE_DATE_HEADER = "EEE, dd MMM yyyy HH:mm:ss zzz";

    //http响应头Expire属性时间格式工具
    public static final SimpleDateFormat responseHeaderFormat = new SimpleDateFormat(HTTP_RESPONSE_DATE_HEADER,Locale.US);

    static{
        responseHeaderFormat.setTimeZone(TimeZone.getTimeZone("GMT"));
    }

    /**
     * 某个时间点的下个月的第一天
     * @param day
     * @return
     */
    public static Date firstDayInNextMonth(Date day){
        Calendar c = Calendar.getInstance();
        c.setTime(day);
        c.set(Calendar.MONTH, c.get(Calendar.MONTH)+1);
        c.set(Calendar.DAY_OF_MONTH, 1);
        c.set(Calendar.HOUR_OF_DAY, 0);
        c.set(Calendar.MINUTE, 0);
        c.set(Calendar.SECOND, 0);
        return c.getTime();
    }

    /**
     * 获取某天在星期中的排序值：
     * 星期日 -> 星期六 对应为：1 -> 7
     * @param date
     * @return
     */
    public static int getDateInWeek(Date date) {
        Calendar c = Calendar.getInstance();
        c.setTime(date);
        return c.get(Calendar.DAY_OF_WEEK);
    }

    /**
     * 获取指定日期后n天的凌晨
     * @param date
     * @param n
     * @return
     */
    public static Date getDateNextDay(Date date, int n) {
        Calendar c = Calendar.getInstance();
        c.setTime(date);
        c.add(Calendar.DATE, n);
        return c.getTime();
    }

    /**
     * 获取下n个月后的日期
     * @param n 月份偏移量
     * @return
     */
    public static Date getDateNextMonth(int n) {
        Calendar now = Calendar.getInstance();
        now.set(Calendar.MONTH, now.get(Calendar.MONTH) + n);// 设置时间向前进n个月
        now.set(Calendar.HOUR_OF_DAY, 0);
        now.set(Calendar.MINUTE, 0);
        now.set(Calendar.SECOND, 0);
        return now.getTime();
    }

    /**
     * 获取今天在本月中的号码
     * @return
     */
    public static int getDateOfMoth() {
        return Calendar.getInstance().get(Calendar.DAY_OF_MONTH);
    }

    /**
     * 本月的所有日期集合
     * @return
     */
    public static List<Date> getDatesInMonth() {

        List<Date> dates = new ArrayList<Date>();

        Calendar c = Calendar.getInstance();

        // 设置代表的日期为1号
        c.set(Calendar.DATE, 1);

        // 获得当前月的最大日期数
        int maxDay = c.getActualMaximum(Calendar.DATE);

        for (int i = 1; i <= maxDay; i++) {
            c.set(Calendar.DATE, i);
            dates.add(c.getTime());
        }

        return dates;
    }

    /**
     * 获取某个时间所在的月份
     * @param date
     * @return
     */
    public static int getMonth(Date date) {
        Calendar c = Calendar.getInstance();
        c.setTime(date);
        return c.get(Calendar.MONTH) + 1;
    }

    /**
     * 获取本月最后一天
     * @return
     */
    public static Date getMonthEnd() {
        int length = getDateOfMoth();
        Calendar c = Calendar.getInstance();
        c.set(Calendar.DATE, length);
        c.set(Calendar.HOUR, 24);
        c.set(Calendar.MINUTE, 0);
        c.set(Calendar.SECOND, 0);
        return c.getTime();
    }

    /**
     * 获取某个时间所在月份的最后一秒
     * @param date
     * @return
     */
    public static Date getMonthEnd(Date date){
        if(date == null){
            return null;
        }
        Calendar start = Calendar.getInstance();
        start.setTime(date);
        start.set(Calendar.MONTH, start.get(Calendar.MONTH)+1);
        start.set(Calendar.DAY_OF_MONTH, 1);
        start.set(Calendar.HOUR, 0);
        start.set(Calendar.MINUTE, 0);
        start.set(Calendar.SECOND, 0);
        return start.getTime();
    }

    /**
     * 获取某个时间所在月份的第一天凌晨
     * @param date
     * @return
     */
    public static Date getMonthStart(Date date){
        if(date == null){
            return null;
        }
        Calendar start = Calendar.getInstance();
        start.setTime(date);
        start.set(Calendar.DAY_OF_MONTH, 1);
        start.set(Calendar.HOUR, 0);
        start.set(Calendar.MINUTE, 0);
        start.set(Calendar.SECOND, 0);
        return start.getTime();
    }

    /**
     * 获取今天凌晨
     * @return
     */
    public static Date getMorning() {
        return getMorning(new Date());
    }

    /**
     * 获取指定时间当天的凌晨
     * @param date 给定时间当天的凌晨
     * @return
     */
    public static Date getMorning(Date date) {
        Calendar c = Calendar.getInstance();
        c.setTime(date);
        c.set(Calendar.HOUR_OF_DAY, 0);
        c.set(Calendar.MINUTE, 0);
        c.set(Calendar.SECOND, 0);
        return c.getTime();
    }

    /**
     * 获取当前时间N天后的凌晨
     */
    public static Date getMorningNextDate(int n) {
        Calendar now = Calendar.getInstance();
        now.set(Calendar.DATE, now.get(Calendar.DATE) + n); //设置时间向前进n天
        now.set(Calendar.HOUR_OF_DAY, 0);
        now.set(Calendar.MINUTE, 0);
        now.set(Calendar.SECOND, 0);
        return now.getTime();
    }

    /**
     * 系统当前时间过N个月后的时间
     * @param nextStep 月份偏移量
     * @return
     */
    public static Date getNextMonth(int nextStep){
        Calendar c = Calendar.getInstance();
        int m = c.get(Calendar.MONTH);
        c.set(Calendar.MONTH, m + nextStep);
        return c.getTime();
    }

    /**
     * 计算给定时间推进一个月对应的时间
     * @param date 给定时间
     * @return 某时间过一个月后所在的时间
     */
    public static Date getNextMonthToday(Date date){
        Calendar c = Calendar.getInstance();
        c.setTime(date);
        c.set(Calendar.MONTH, c.get(Calendar.MONTH)+1);
        return c.getTime();
    }

    /**
     * 获取系统当前时间所在的年份
     * @return
     */
    public static int getYear() {
        return Calendar.getInstance().get(Calendar.YEAR);
    }

    /**
     * 获取给定时间所在的年份
     * @param date 时间
     * @return 时间所在的年份
     */
    public static int getYear(Date date){
        Calendar c = Calendar.getInstance();
        c.setTime(date);
        return c.get(Calendar.YEAR);
    }

    /**
     * 获取某年分的最后一天结束的时间
     * @param year 年份
     * @return 指定年份的最后一天结束
     */
    public static Date getYearEnd(int year) {
        Calendar c = Calendar.getInstance();
        c.set(Calendar.YEAR, year);
        c.set(Calendar.MONTH,Calendar.DECEMBER);
        c.set(Calendar.DAY_OF_MONTH, 31);
        c.set(Calendar.HOUR_OF_DAY, 23);
        c.set(Calendar.MINUTE, 59);
        c.set(Calendar.SECOND, 59);
        return c.getTime();
    }

    /**
     * 获取某年份的第一天凌晨
     * @param year 年份
     * @return 指定年份的第一天凌晨
     */
    public static Date getYearStart(int year) {
        Calendar c = Calendar.getInstance();
        c.set(Calendar.YEAR, year);
        c.set(Calendar.MONTH, Calendar.JANUARY);
        c.set(Calendar.DAY_OF_MONTH,1);
        c.set(Calendar.HOUR_OF_DAY, 0);
        c.set(Calendar.MINUTE, 0);
        c.set(Calendar.SECOND, 0);
        return c.getTime();
    }
}