datetime.java

图书管理系统,B/S,C/S都有,附有源代码

package database;

import java.util.*;

/**
 * <p>Title: library</p>
 * <p>Description: library</p>
 * <p>Copyright: Copyright (c) 2007</p>
 * <p>Company: </p>
 * @author nino
 * @version 0.1
 */

public class DateTime {

  /**
   * 取年日期时间
   * @return String 返回 yyyy-MM-dd HH:mm:ss
   */
  public static String getDateTime() {
    java.text.SimpleDateFormat formatter = new java.text.SimpleDateFormat(
        "yyyy-MM-dd HH:mm:ss");
    java.util.Date currentTime = new java.util.Date(); //得到当前系统时间
    String newDateTime = formatter.format(currentTime); //将日期时间格式化
    return newDateTime;
  }

  public static String getDate() {
    java.text.SimpleDateFormat formatter = new java.text.SimpleDateFormat(
        "yyyy-MM-dd");
    java.util.Date currentTime = new java.util.Date(); //得到当前系统时间
    String newDate = formatter.format(currentTime); //将日期格式化
    return newDate;
  }

  public boolean isExp(String newExpDate) {

    //获取当前系统时间
    java.text.SimpleDateFormat formatter = new java.text.SimpleDateFormat(
        "yyyy-MM-dd");
    java.util.Date currentTime = new java.util.Date(); //得到当前系统时间
    String newCurDate = formatter.format(currentTime); //将日期格式化

    //把日期字符串分开成年月日
    String[] ED = newExpDate.split("-");
    String[] CD = newCurDate.split("-");

    //创建Calendar实例
    Calendar CD1 = Calendar.getInstance();
    Calendar CD2 = Calendar.getInstance();

    //把字符串型的年月日转换为数值,并设置日期
    CD1.set(Integer.parseInt(ED[0]), Integer.parseInt(ED[1]),
            Integer.parseInt(ED[2]), 0, 0, 0);
    CD2.set(Integer.parseInt(CD[0]), Integer.parseInt(CD[1]),
            Integer.parseInt(CD[2]), 0, 0, 0);

    //比较日期,86400000=1000*60*60*24
    int days = (int) ( (CD1.getTimeInMillis() - CD2.getTimeInMillis()) /
                      86400000);
    if (days < 0) {
      return true;
    }
    else {
      return false;
    }

  }

  public boolean isExp(String newDate1, String newDate2) {

    //把日期字符串分开成年月日
    String[] SD1 = newDate1.split("-");
    String[] SD2 = newDate2.split("-");

    //创建Calendar实例
    Calendar CD1 = Calendar.getInstance();
    Calendar CD2 = Calendar.getInstance();

    //把字符串型的年月日转换为数值,并设置日期
    CD1.set(Integer.parseInt(SD1[0]), Integer.parseInt(SD1[1]),
            Integer.parseInt(SD1[2]), 0, 0, 0);
    CD2.set(Integer.parseInt(SD2[0]), Integer.parseInt(SD2[1]),
            Integer.parseInt(SD2[2]), 0, 0, 0);

    //比较日期,86400000=1000*60*60*24
    int days = (int) ( (CD1.getTimeInMillis() - CD2.getTimeInMillis()) /
                      86400000);
    if (days < 0) {
      return true;
    }
    else {
      return false;
    }

  }

  public String gainYear(String newDate, int newYear) {

    //把日期字符串分开成年月日
    String[] SD = newDate.split("-");

    //把日期转换为数字
    int intYear = Integer.parseInt(SD[0]);
    String strMonth = SD[1];
    String strDay = SD[2];

    //增加年
    intYear += newYear;

    //返回日期
    return intYear + "-" + strMonth + "-" + strDay;
  }

  public String gainMonth(String newDate, int newMonth) {

    //把日期字符串分开成年月日
    String[] SD = newDate.split("-");

    //把日期转换为数字
    int intYear = Integer.parseInt(SD[0]);
    int intMonth = Integer.parseInt(SD[1]);
    String strMonth;
    String strDay = SD[2];

    //增加月
    intMonth += newMonth;

    //计算年月
    while (intMonth > 12) {
      intMonth -= 12;
      intYear++;
    }

    //如果月份小于10,前面增加0
    if (intMonth < 10) {
      strMonth = "0" + intMonth;
    }
    else {
      strMonth = Integer.toString(intMonth);
    }

    //返回日期
    return intYear + "-" + strMonth + "-" + strDay;
  }

  public String gainMonth(int newMonth) {

    //获取当前系统时间
    java.text.SimpleDateFormat formatter = new java.text.SimpleDateFormat(
        "yyyy-MM-dd");
    java.util.Date currentTime = new java.util.Date(); //得到当前系统时间
    String newCurDate = formatter.format(currentTime); //将日期格式化

    //把日期字符串分开成年月日
    String[] SD = newCurDate.split("-");

    //把日期转换为数字
    int intYear = Integer.parseInt(SD[0]);
    int intMonth = Integer.parseInt(SD[1]);
    String strMonth;
    String strDay = SD[2];

    //增加月
    intMonth += newMonth;

    //计算年月
    while (intMonth > 12) {
      intMonth -= 12;
      intYear++;
    }

    //如果月份小于10,前面增加0
    if (intMonth < 10) {
      strMonth = "0" + intMonth;
    }
    else {
      strMonth = Integer.toString(intMonth);
    }

    //返回日期
    return intYear + "-" + strMonth + "-" + strDay;
  }

}