package com.azcctl.zdjcx.util;

import java.sql.Timestamp;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;

public class DateTime {
	public static final SimpleDateFormat FORMAT = new SimpleDateFormat("yy/MM/dd HH:mm:ss");
	
	/**
	 * 比较两日期大小
	 * @param d1
	 * @param d2
	 * @return
	 */
	
	
	/*
	 * 
	 * --取得当天0时0分0秒
select TRUNC(SYSDATE) FROM dual;

--取得当天23时59分59秒(在当天0时0分0秒的基础上加1天后再减1秒)
SELECT TRUNC(SYSDATE)+1-1/86400 FROM dual;

--取得当前日期是一个星期中的第几天,注意：星期日是第一天
select to_char(sysdate,'D'),to_char(sysdate,'DAY') from dual;

--在oracle中如何得到当天月份的第一天和最后一天
select to_char(sysdate,'yyyy-mm')||'-01' firstday,to_char(last_day(sysdate),'yyyy-mm-dd') lastday from dual

--实现当天16点前数据减去昨天16点的，过了16点减去今天16点
select field1, field2 from mytable
where time = decode(sign(sysdate-trunc(sysdate)-16/24), --时间判断
                     -1,trunc(sysdate)-1+16/24, --小于16点取昨天16点
                        trunc(sysdate)+16/24)  --大于16点取当天16点 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 */
	public static int compare(Date d1, Date d2) {   
        String str1 = FORMAT.format(d1);   
        							System.out.println("str1: " + str1);   
        String str2 = FORMAT.format(d2);   
        							System.out.println("str2: " + str2);   
  
        int result = str1.compareTo(str2);
        
        return result;
        /*if (result > 0) {   
            System.out.println(str1 + " 晚于 " + str2);   
        } else if (result == 0) {   
            System.out.println(str1 + " 等于 " + str2);   
        } else {   
            System.out.println(str1 + " 早于 " + str2);   
        }   */
    } 
	
	/**
	 * 获取当天23:59:59
	 * @return
	 */
	public static Date getBeforZeroTime() {
		Date beforZeroDate = null;
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd 23:59:59");
		SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		Calendar c = Calendar.getInstance();
		c.add(Calendar.DAY_OF_MONTH, 0);
		try {
			beforZeroDate = sdf2.parse(sdf.format(c.getTime()));
		} catch (ParseException e) {
			e.printStackTrace();
		}
		
		return beforZeroDate;
	}
	
	/**
	 * 获取当天00:00:00
	 * @return
	 */
	public static Date getZeroTime() {
		Date zeroDate = null;
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd 00:00:00");
		Calendar c = Calendar.getInstance();
		c.add(Calendar.DAY_OF_MONTH, 0);
		try {
			zeroDate = sdf.parse(sdf.format(c.getTime()));
		} catch (ParseException e) {
			e.printStackTrace();
		}
		
		return zeroDate;
	}
	
	/**
	 * 输入时、分、秒，转换为小时返回
	 * @param Hour
	 * @param minutes
	 * @param sec
	 * @return
	 */
	public static double getHours(double Hour,double minutes,double sec) {
		double hours = Hour+minutes/60+sec/3600;
		return hours;
	}
	/*
	 * 得到当前时间 
	 */
	public static String  getNowTime(){
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		Timestamp nowTimestamp = new Timestamp(new Date().getTime());
		String nowTime = sdf.format(new java.util.Date(nowTimestamp.getTime()));
		return nowTime;
	}
	/*
	 * 得到当前时间 
	 */
	public static String  getNowDate(){
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
		Timestamp nowTimestamp = new Timestamp(new Date().getTime());
		String nowTime = sdf.format(new java.util.Date(nowTimestamp.getTime()));
		return nowTime;
	}
	/*
	 * formate date
	 */
	public static String getFormatDate(Date date){
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss",Locale.CHINA);
		String dateStr = sdf.format(date);
		return dateStr;
	}
	
	
    public static String getTimeSS(){
    	String str = "";    
	    SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMddHHmmss");        
	    Calendar lastDate = Calendar.getInstance();    
	    str=sdf.format(lastDate.getTime());    
	    return str;  
    }
	/*
	 * string to date 
	 */
	public static Date StrToDate(String str){
		
		SimpleDateFormat sdf = null;
		Date date = null;
		sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		try {
			date = sdf.parse(str);
		} catch (ParseException e) {
			e.printStackTrace();
		}
		
		return date;
	}
	
	  public static Date stringToDate(String str) { 
	        DateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); 
	        Date date = null; 
	        try { 
	            // Fri Feb 24 00:00:00 CST 2012 
	            date = format.parse(str);  
	        } catch (ParseException e) { 
	            e.printStackTrace(); 
	        } 
	        // 2012-02-24 
	        //date = java.sql.Date.valueOf(str); 
	                                              
	        return date; 
	    } 
	  public  String  getCurrentDate(){
	    	 Date date = new Date();  
		    SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
		    String  years= sdf.format(date);
		    return years;    
	  }
	  
	 // 2011-04-13 09:41 java 判断今天 昨天 前天... 
	  public String parseDate(String createTime){    
	        try {
	            String ret = "";
	            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
	            long create = sdf.parse(createTime).getTime();
	            Calendar now = Calendar.getInstance();
	            long ms  = 1000*(now.get(Calendar.HOUR_OF_DAY)*3600+now.get(Calendar.MINUTE)*60+now.get(Calendar.SECOND));//毫秒数
	            long ms_now = now.getTimeInMillis();
	            if(ms_now-create<ms){
	                ret = "今天";
	            }else if(ms_now-create<(ms+24*3600*1000)){
	                ret = "昨天";
	            }else if(ms_now-create<(ms+24*3600*1000*2)){
	                ret = "前天";
	            }else{
	                ret= "更早";
	            }
	            return ret;
	            } catch (Exception e) {
	            e.printStackTrace();
	            }
	        return null;
	    }


}