DateUtil

package org.archer.test;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class DateUtil {

  public static String YYYY_MM_DD = "yyyy-MM-dd";
  public static String YYYYMMDD = "yyyyMMdd";
  public static String YYYYMM = "yyyyMM";
  public static String YYYY_MM = "yyyy-MM";
  public static String YYYY_MM_DD_HH_MM = "yyyy-MM-dd HH:mm";
  public static String YYYYMMDDHHMM = "yyyyMMddHHmm";
  public static String YYYYMMDDHHMMSS = "yyyyMMddHHmmss";
  public static String YYYY_MM_DD_HH_MM_SS = "yyyy-MM-dd HH:mm:ss";

  /**
   * 将字符串时间改成Date类型
   */
  public static Date strToDate(String dateStr, String format) {

    Date date = null;

    try {
      SimpleDateFormat simpleDateFormat = new SimpleDateFormat(format);
      date = simpleDateFormat.parse(dateStr);
    } catch (ParseException e) {
      e.printStackTrace();
    }

    return date;
  }

  /**
   * 将Date时间转成字符串
   */
  public static String DateToStr(String format, Date date) {
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat(format);
    return simpleDateFormat.format(date);
  }

  /**
   * 获取2个字符日期的天数差
   * @return 天数差
   */
  public static long getDaysOfTowDiffDate(String p_startDate, String p_endDate) {

    Date l_startDate = DateUtil.strToDate(DateUtil.YYYY_MM_DD, p_startDate);
    Date l_endDate = DateUtil.strToDate(DateUtil.YYYY_MM_DD, p_endDate);
    long l_startTime = l_startDate.getTime();
    long l_endTime = l_endDate.getTime();
    long betweenDays = (long) ((l_endTime - l_startTime) / (1000 * 60 * 60 * 24));
    return betweenDays;
  }

  /**
   * 获取2个Date型日期的分钟数差值
   * @param p_startDate
   * @param p_endDate
   * @return 分钟数差值
   */
  public static long getMinutesOfTowDiffDate(Date p_startDate, Date p_endDate) {
    long l_startTime = p_startDate.getTime();
    long l_endTime = p_endDate.getTime();
    long betweenMinutes = (long) ((l_endTime - l_startTime) / (1000 * 60));
    return betweenMinutes;
  }

  /**
   * 获取2个字符日期的天数差
   * @param p_startDate
   * @param p_endDate
   * @return 天数差
   */
  public static long getDaysOfTowDiffDate(Date l_startDate, Date l_endDate) {

    long l_startTime = l_startDate.getTime();
    long l_endTime = l_endDate.getTime();
    long betweenDays = (long) ((l_endTime - l_startTime) / (1000 * 60 * 60 * 24));
    return betweenDays;
  }

  /**
   * 给出日期添加一段时间后的日期
   * 
   * @param dateStr
   * @param plus
   * @return
   */
  public static String getPlusDays(String format, String dateStr, long plus) {

    Date date = DateUtil.strToDate(format, dateStr);
    long time = date.getTime() + plus * 24 * 60 * 60 * 1000;

    return DateUtil.DateToStr(format, new Date(time));
  }

  /**
   * 给出日期添加一段时间后的日期
   */
  public static String getPlusDays(String format, Date date, long plus) {

    long time = date.getTime() + plus * 24 * 60 * 60 * 1000;

    return DateUtil.DateToStr(format, new Date(time));
  }
}