操作日期工具类

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

public class DateUtil {

	/**
	 * 
	 * <p>
	 * 简述:获取当天时间  str
	 * </p>
	 * <p>
	 * 描述:
	 * </p>
	 * @param dateformat "yyyy-MM-dd" "yyyy-MM-dd HH:mm:ss"
	 * @return
	 * @see [类、类#方法、类#成员]
	 */
    public static String getNowTimeStr(String dateformat){  
        Date   now   =   new   Date();     
        //可以方便地修改日期格式
        SimpleDateFormat   dateFormat   =   new   SimpleDateFormat(dateformat);     
        String  hehe  = dateFormat.format(now);     
        return hehe;  
    } 
	/**
	 * 
	 * <p>
	 * 简述:获取当天时间 date
	 * </p>
	 * <p>
	 * 描述:
	 * </p>
	 * @param dateformat "yyyy-MM-dd" "yyyy-MM-dd HH:mm:ss"
	 * @return
	 * @see [类、类#方法、类#成员]
	 */
    public static Date getNowTimeDate(String dateformat){  
        Date   now   =   new   Date();     
        //可以方便地修改日期格式
        SimpleDateFormat   dateFormat   =   new   SimpleDateFormat(dateformat);     
        String  hehe  = dateFormat.format(now);
        return getStrToDate(hehe, dateformat);
    }
    
	/**
	 * 
	 * <p>
	 * 简述:获取距今天的指定天数
	 * </p>
	 * <p>
	 * 描述:
	 * </p>
	 * @param index 指定天数 （今天之前的天数是负数，今天之后的是正数）
	 * @return
	 * @see [类、类#方法、类#成员]
	 */
	public static String getDayByIndex(int index) {
		Calendar c = Calendar.getInstance();
		Date date = new Date(System.currentTimeMillis());
		c.setTime(date);
		int day = c.get(Calendar.DATE);
		c.set(Calendar.DATE, day + index);
		String dayAfter = new SimpleDateFormat("yyyy-MM-dd")
				.format(c.getTime());
		return dayAfter;
	}

	/**
	 * 
	 * <p>
	 * 简述:转换日期成字符串
	 * </p>
	 * <p>
	 * 描述:
	 * </p>
	 * @param date  日期类型
	 * @param format "yyyy-MM-dd" "yyyy-MM-dd HH:mm:ss"
	 * @return
	 * @see [类、类#方法、类#成员]
	 */
	public static String getDateToStr(Date date, String format) {
		return new SimpleDateFormat(format).format(date);
	}

 

评论

4 楼 sblig 2011-11-22  

	/** 
	 * <p>
	 * 简述:sql.timestamp 类型转换成util.date
	 * </p>
	 * <p>
	 * 描述:
	 * </p>
	 * @param time Timestamp
	 * @param fmtString 格式 yyyy-MM-dd HH:mm:ss
	 * @return
	 * @see [类、类#方法、类#成员]
	 */
	public static Date getTimestampToDate(Timestamp time,String fmtString){
		Date date = null;
		String timeString = getTimestampToStr(time,fmtString);
		date = getStrToDate(timeString,fmtString);
		
		return date;
	}
	
	/**
	 * 
	 * <p>
	 * 简述:转换成 sql.timestamp 类型
	 * </p>
	 * <p>
	 * 描述:
	 * </p>
	 * @param dateStr 日期字符串 2011-06-21 14:31:00
	 * @return
	 * @see [类、类#方法、类#成员]
	 */
	public static Timestamp getStrToTimestamp(String dateStr){
		Timestamp time = null;
		time = java.sql.Timestamp.valueOf(dateStr); 
		return time;
	}
	
	/** 
	 * <p>
	 * 简述:将Timestamp类型转换为字符串
	 * </p>
	 * <p>
	 * 描述:
	 * </p>
	 * @param time Timestamp
	 * @param format "yyyy-MM-dd" "yyyy-MM-dd HH:mm:ss"
	 * @return
	 * @see [类、类#方法、类#成员]
	 */
	public static String getTimestampToStr(Timestamp time, String format) {
		return new SimpleDateFormat(format).format(time);
	}

3 楼 sblig 2011-11-22  

	/**
	 * 
	 * <p>
	 * 简述:获取当天零点的时间 str 2011-07-05 00:00:00
	 * </p>
	 * <p>
	 * 描述:
	 * </p>
	 * @param fmtString
	 * @return
	 * @see [类、类#方法、类#成员]
	 */
	public static String getStringZeroDate(String fmtString){
		return getLongToStr(get24HourMill(), fmtString);
	}
	
	/**
	 * 
	 * <p>
	 * 简述:获取当天零点的时间 Date 2011-07-05 00:00:00
	 * </p>
	 * <p>
	 * 描述:
	 * </p>
	 * @param fmtString
	 * @return
	 * @see [类、类#方法、类#成员]
	 */
	public static Date  getDateZeroDate(String fmtString){
		String dateStr  = getLongToStr(get24HourMill(), fmtString);
		return getStrToDate(dateStr, fmtString);
	}
	
	/**
	 * 
	 * <p>
	 * 简述:获取当天晚上点时间 23:59:59
	 * </p>
	 * <p>
	 * 描述:
	 * </p>
	 * @param fmtString
	 * @return
	 * @see [类、类#方法、类#成员]
	 */
	public static Date  getDateNightDate(String fmtString){
		String dateStr  = getLongToStr(get24HourMillNight(), fmtString);
		return getStrToDate(dateStr, fmtString);
	}
	
	/**
	 * 
	 * <p>
	 * 简述:获取当天晚上点时间 23:59:59
	 * </p>
	 * <p>
	 * 描述:
	 * </p>
	 * @param fmtString
	 * @return
	 * @see [类、类#方法、类#成员]
	 */
	public static String getStringNightDate(String fmtString){
		return getLongToStr(get24HourMillNight(), fmtString);
	}
	
	//获取当天零点时间
	private static long get24HourMill(){
	    Calendar   calendar   =   Calendar.getInstance(); 
	    calendar.set(Calendar.HOUR_OF_DAY,   0);   
	    calendar.set(Calendar.MINUTE,   0);   
	    calendar.set(Calendar.SECOND,   0);   
	    calendar.set(Calendar.MILLISECOND,   0);
	    calendar.add(Calendar.DAY_OF_MONTH, 0);
	    long l1 = calendar.getTimeInMillis();
	    return l1;
	}

	//获取当天晚上点时间 23:59:59
	private static long get24HourMillNight(){
	    Calendar   calendar   =   Calendar.getInstance(); 
	    calendar.set(Calendar.HOUR_OF_DAY,   23);   
	    calendar.set(Calendar.MINUTE,   59);   
	    calendar.set(Calendar.SECOND,   59);   
	    calendar.set(Calendar.MILLISECOND,   0);
	    calendar.add(Calendar.DAY_OF_MONTH, 0);
	    long l1 = calendar.getTimeInMillis();
	    return l1;
	}
	
	/**
	 * 
	 * <p>
	 * 简述: util.date 转换成 sql.timestamp 类型
	 * </p>
	 * <p>
	 * 描述:
	 * </p>
	 * @param date  日期
	 * @param fmtString 格式 yyyy-MM-dd HH:mm:ss
	 * @return
	 * @see [类、类#方法、类#成员]
	 */
	public static Timestamp getDateToTimestamp(Date date,String fmtString){
		Timestamp time = null;
		String dateString = getDateToStr(date, fmtString);
		time = java.sql.Timestamp.valueOf(dateString); 
		
		return time;
	}

2 楼 sblig 2011-11-22  

	/**
	 * 
	 * <p>
	 * 简述:Java Calender类获得指定日期的后一天
	 * </p>
	 * <p>
	 * 描述:
	 * </p>
	 * @param specifiedDay
	 * @return
	 * @see [类、类#方法、类#成员]
	 */
	public static String getSpecifiedDayAfter(String specifiedDay) {
		Calendar c = Calendar.getInstance();
		Date date = null;
		try {
			date = new SimpleDateFormat("yyyy-MM-dd").parse(specifiedDay);

			c.setTime(date);
			int day = c.get(Calendar.DATE);
			c.set(Calendar.DATE, day + 1);

		} catch (ParseException e) {
			e.printStackTrace();
		}
		String dayAfter = new SimpleDateFormat("yyyy-MM-dd")
				.format(c.getTime());
		return dayAfter;
	}

	/**
	 * 计算时间差
	 * 
	 * @param begin  
	 * @param end  
	 * @param type 1 计算小时差  2 计算 分钟差  3计算秒差
	 * @return
	 */
	public static int countTimeDate(Date begin,Date end,int type){
		int result = 0;
		long total_minute = 0;
		Date begin_date = begin;
		Date end_date = end;

		total_minute = (end_date.getTime() - begin_date.getTime())
				/ (1000 * 60);
		
		if (1 == type) {
			result = (int) total_minute / 60;
		} else if (2 == type) {
			result = (int) (total_minute + total_minute % 60);
		} else {
			result = (int) (((total_minute + total_minute % 60) * 60) + (end_date
					.getTime() - begin_date.getTime()) / 1000 % 60);
		}

		return result;
	}
	/**
	 * 计算时间差
	 * 
	 * @param begin  
	 * @param end  
	 * @param type 1 计算小时差  2 计算 分钟差  3计算秒差
	 * @return
	 */
	public static long countTime(String begin, String end, int type) {
		long result = 0;
		long total_minute = 0;
		StringBuffer sb = new StringBuffer();
		DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		try {
			Date begin_date = df.parse(begin);
			Date end_date = df.parse(end);

			total_minute = (end_date.getTime() - begin_date.getTime())
					/ (1000 * 60);
			if (1 == type) {
				result = (int) total_minute / 60;
			} else if (2 == type) {
				result = (end_date.getTime() - begin_date.getTime())/1000/60;
				
//				result = (int) (total_minute + total_minute % 60);
			} else {
				//毫秒之差/1000
				result = (end_date.getTime() - begin_date.getTime())/1000;
				/*result = (int) (((total_minute + total_minute % 60) * 60) + (end_date
						.getTime() - begin_date.getTime()) / 1000 % 60);*/
			}

		} catch (ParseException e) {
			e.printStackTrace();
		}
		return result;
	}

	/**
	 * 
	 * <p>
	 * 简述:时间点加上一段时间间隔，得到新的时间点
	 * </p>
	 * <p>
	 * 描述:
	 * </p>
	 * @param start 开始时间点
	 * @param num   时间间隔
	 * @param type  1 时间间隔为小时，2 时间间隔为分钟，3时间间隔为秒，4时间间隔为毫秒
	 * @return
	 * @see [类、类#方法、类#成员]
	 */
	public static Date addNumToDate(Date start, int num, int type) {
		Date end = null;
		try {
			if (1 == type) {
				end = getLongToDate(start.getTime() + num * 60 * 60 * 1000);
			} else if (2 == type) {
				end = getLongToDate(start.getTime() + num * 60 * 1000);
			} else if (3 == type) {
				end = getLongToDate(start.getTime() + num * 1000);
			} else {
				end = getLongToDate(start.getTime() + num);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return end;
	}

1 楼 sblig 2011-11-22  

	/**
	 * 
	 * <p>
	 * 简述:日期型转换成Long型
	 * </p>
	 * <p>
	 * 描述:
	 * </p>
	 * @param date
	 * @return
	 * @see [类、类#方法、类#成员]
	 */
	public static Long getDateToLong(Date date) {
		return date.getTime();
	}

	/**
	 * 
	 * <p>
	 * 简述:str 转换成 Date
	 * </p>
	 * <p>
	 * 描述:
	 * </p>
	 * @param dateString  "2011-05-20 14:22:22"
	 * @param fmtString  "yyyy-MM-dd" "yyyy-MM-dd hh:mm:ss"
	 * @return
	 * @see [类、类#方法、类#成员]
	 */
	public static Date getStrToDate(String dateString, String fmtString) {

		SimpleDateFormat sdf = new SimpleDateFormat(fmtString);
		Date date = null;
		try {
			date = sdf.parse(dateString);
		} catch (ParseException e) {
			e.printStackTrace();
		}
		return date;
	}

	/**
	 * 
	 * <p>
	 * 简述:long 转换成 Date
	 * </p>
	 * <p>
	 * 描述:
	 * </p>
	 * @param dateLong
	 * @return
	 * @see [类、类#方法、类#成员]
	 */
	public static Date getLongToDate(Long dateLong) {
		Date date = new Date(dateLong);

		return date;
	}

	/**
	 * 
	 * <p>
	 * 简述: Long 型日期 转换成字符串
	 * </p>
	 * <p>
	 * 描述:
	 * </p>
	 * @param dateLong
	 * @param fmtString "yyyy-MM-dd" "yyyy-MM-dd HH:mm:ss"
	 * @return
	 * @see [类、类#方法、类#成员]
	 */
	public static String getLongToStr(Long dateLong, String fmtString) {
		return getDateToStr(getLongToDate(dateLong), fmtString);
	}

	/**
	 * 
	 * <p>
	 * 简述:Java Calender类获得指定日期的前一天
	 * </p>
	 * <p>
	 * 描述:
	 * </p>
	 * @param specifiedDay
	 * @return
	 * @see [类、类#方法、类#成员]
	 */
	public static String getSpecifiedDayBefore(String specifiedDay) {
		//SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd"); 
		Calendar c = Calendar.getInstance();
		Date date = null;
		try {
			date = new SimpleDateFormat("yyyy-MM-dd").parse(specifiedDay);

			c.setTime(date);
			int day = c.get(Calendar.DATE);
			c.set(Calendar.DATE, day - 1);

		} catch (ParseException e) {
			e.printStackTrace();
		}
		String dayBefore = new SimpleDateFormat("yyyy-MM-dd").format(c
				.getTime());
		return dayBefore;
	}