日期工具类

package com.payease.chains.risk.utils;

import org.apache.commons.lang.time.DateUtils;

import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

/**
 * @Author : zhangwen
 * @Data : 2017/9/18
 * @Description :
 */
public class DateUtil {

    //日期时间格式
    public static String FORMAT_PATTERN_DATE = "yyyy-MM-dd";
    //时分秒时间格式
    public static String FORMAT_PATTERN_TIME = "yyyy-MM-dd HH:mm:ss";


    /**
     * @Author zhangwen
     * @MethodName getDaySpace
     * @Params [fromDay, toDay]
     * @Return int
     * @Date 2017/9/18 上午10:38
     * @Desp 获取两个日期的时间差值
     */
    public static int getDaySpace(Date fromDay, Date toDay) throws Exception {
        SimpleDateFormat simpleFormat = new SimpleDateFormat(FORMAT_PATTERN_TIME);
        String fromDate = simpleFormat.format(fromDay);
        String toDate = simpleFormat.format(toDay);
        long from = simpleFormat.parse(fromDate).getTime();
        long to = simpleFormat.parse(toDate).getTime();
        int days = (int) ((to - from) / (1000 * 60 * 60 * 24));
        return days;
    }

    /**
     * @Author zhangwen
     * @MethodName getNow
     * @Params [pattern]
     * @Return java.util.Date
     * @Date 2017/9/18 上午10:40
     * @Desp 获取系统当前时间
     */
    public static Date getNow(String pattern) throws Exception {
        SimpleDateFormat sdf = new SimpleDateFormat(pattern);
        return sdf.parse(sdf.format(new Date()));
    }

    /**
     * @Author zhangwen
     * @MethodName parseDate
     * @Params [parseStr, pattern]
     * @Return java.util.Date
     * @Date 2017/9/18 上午10:45
     * @Desp 格式化时间 返回时间类型
     */
    public static Date parseDate(String parseStr, String pattern) throws Exception {

        SimpleDateFormat sdf = new SimpleDateFormat(pattern);
        return sdf.parse(parseStr);
    }

    /**
     * @Author zhangwen
     * @MethodName formatDate
     * @Params [date, pattern]
     * @Return java.lang.String
     * @Date 2017/9/18 下午4:36
     * @Desp 时间格式化 返回字符串类型
     */
    public static String formatDate(Date date, String pattern) throws Exception {
        SimpleDateFormat sdf = new SimpleDateFormat(pattern);
        return sdf.format(date);
    }

    public static void main(String[] args) {
        try {
            Date from = parseDate("2017-06-12", FORMAT_PATTERN_DATE);
            Date now = getNow(FORMAT_PATTERN_DATE);
            System.out.println(getDaySpace(from, now));


        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 得到一天的最后一秒钟
     *
     * @param d
     * @return
     * @Author lch
     */
    public static Date endOfDay(Date d) {
        return DateUtils.addSeconds(
                DateUtils.addDays(DateUtils.truncate(d, Calendar.DATE), 1), -1);
    }
}