Time

package com.share.tool.oman.date;

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

public class SystemDateClass {
 public static String getDateNow() {
  String now = "";
  SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
  now = sdf.format(new Date());
  return now;
 }

 public static String getYYYYMMddHHmmss() {
  String now = "";
  SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
  now = sdf.format(new Date());
  return now;
 }

 public static String getDate() {
  String now = "";
  SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
  now = sdf.format(new Date());
  return now;
 }

 public static String getYear() {
  String now = "";
  SimpleDateFormat sdf = new SimpleDateFormat("yyyy");
  now = sdf.format(new Date());
  return now;
 }

 public static String getMonth() {
  String now = "";
  SimpleDateFormat sdf = new SimpleDateFormat("MM");
  now = sdf.format(new Date());
  return now;
 }

 public static String getPrvMonth() {
  Calendar tt = Calendar.getInstance();
  String now = getDate();
  String[] tmp = now.split("-");
  tt.set(new Integer(tmp[0]), new Integer(tmp[1]) - 2,
    new Integer(tmp[2]));
  SimpleDateFormat sdf = new SimpleDateFormat("MM");
  now = sdf.format(tt.getTime());
  return now;
 }

 public static String getDay() {
  String now = "";
  SimpleDateFormat sdf = new SimpleDateFormat("DD");
  now = sdf.format(new Date());
  return now;
 }

 public static int getDaysByMonth(int year, int month) {
  int m = 0;
  switch (month) {
  case 1:
   m = 31;
   break;
  case 2:
   if (year % 4 == 0 && year % 100 != 0)
    m = 29;
   else
    m = 28;
   break;
  case 3:
   m = 31;
   break;
  case 4:
   m = 30;
   break;
  case 5:
   m = 31;
   break;
  case 6:
   m = 30;
   break;
  case 7:
   m = 31;
   break;
  case 8:
   m = 31;
   break;
  case 9:
   m = 30;
   break;
  case 10:
   m = 31;
   break;
  case 11:
   m = 30;
   break;
  case 12:
   m = 31;
   break;
  }
  return m;
 }

 /***
  *
  * @param date
  *            日期字符串格式（yyyy-MM-dd）
  * @return 返回日期類
  */
 public static Date getDateByString(String date) {
  Calendar tt = Calendar.getInstance();
  String[] tmp = date.split("-");
  tt.set(new Integer(tmp[0]), new Integer(tmp[1]) - 1,
    new Integer(tmp[2]));

  return tt.getTime();
 }

 /***
  *
  * @param date
  *            日期字符串格式（yyyy-MM-dd HH:mm:ss）
  * @return 返回日期類
  */
 public static Date getDateByNowString(String dateNow) {
  Calendar tt = Calendar.getInstance();
  String[] tmp1 = dateNow.split(" ");
  String[] tmp = tmp1[0].split("-");
  String[] tmp2 = tmp1[1].split(":");
  tt.set(new Integer(tmp[0]), new Integer(tmp[1]) - 1,
    new Integer(tmp[2]), new Integer(tmp2[0]),
    new Integer(tmp2[1]), new Integer(tmp2[2]));

  return tt.getTime();
 }

 /***
  *
  * @param date
  *            要轉換的日期類
  * @param format
  *            日期返回格式
  * @return 返回日期字符串
  */
 public static String getDateStringByDateAndFormat(Date date, String format) {
  SimpleDateFormat sdf = new SimpleDateFormat(format);
  return sdf.format(date);
 }

 public static String getDateStringByAddDay(Integer day) {
  String date = "";
  Date d = new Date();
  long l = ((long) day) * 24 * 60 * 60 * 1000 + d.getTime();
  d.setTime(l);
  date = getDateStringByDateAndFormat(d, "yyyy-MM-dd HH:mm:ss");
  return date;
 }

 public static String getDateStringByjianDay(Integer day) {
  String date = "";
  Date d = new Date();
  long l = d.getTime() - ((long) day) * 24 * 60 * 60 * 1000;
  d.setTime(l);
  date = getDateStringByDateAndFormat(d, "yyyy-MM-dd HH:mm:ss");
  return date;
 }
 
 public  static String sysdatebyString(String date){
  Date d = new Date(new Long(date));
  SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
  return format.format(d);
 }

}