java中与时间有关的一些常用方法

Posted 2022-11-30 xieweikun7

/**
	 * 获取两个日期之间相差的月数
	 * @param date1
	 * @param date2
	 * @return
	 */
	public static long monthsBetween(Date date1, Date date2) 
		Calendar cal1 = new GregorianCalendar();
		cal1.setTime(date1);
		Calendar cal2 = new GregorianCalendar();
		cal2.setTime(date2);
		long c = (cal1.get(Calendar.YEAR) - cal2.get(Calendar.YEAR)) * 12 + cal1.get(Calendar.MONTH) - cal2.get(Calendar.MONTH);
		return c;
	
	
	/**
	 * 获取两个日期之间相差的天数
	 * @param begin
	 * @param end
	 * @return
	 */
	public static long daysBetween(long begin,long end)
		long btn = end - begin;
		long day = btn/(24*60*60*1000);
		return day;
	
	
	/**
	 * 获取两个日期之间相差的小时数
	 * @param begin
	 * @param end
	 * @return
	 */
	public static long hoursBetween(long begin,long end)
		long btn = end - begin;
		long day = btn/(24*60*60*1000);
		long hour = (btn/(60*60*1000)-day*24);
		return hour;
	
	
	/**
     * 根据日期获得所在周的日期 
     * @param mdate
     * @return
     */
    @SuppressWarnings("deprecation")
    public static List<Date> dateToWeek(Date mdate) 
        int b = mdate.getDay();
        Date fdate;
        List<Date> list = new ArrayList<Date>();
        Long fTime = mdate.getTime() - b * 24 * 3600000;
        for (int a = 1; a <= 7; a++) 
            fdate = new Date();
            fdate.setTime(fTime + (a * 24 * 3600000));
            list.add(a-1, fdate);
        
        return list;
    
    
    /**
	 * 取得当前系统时间，格式为yyyyMMddHHmm
	 * 
	 * @return 当前系统时间，格式为yyyyMMddHHmm
	 */
	public static String getDate12() 
		SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMddHHmm");
		return formatter.format(new Date());
	
	
	/**  
     * 得到指定时间的几分钟前的时间 
     * @param d 指定时间
     * @param minute 分钟数
     * @return
     */  
    public static Date getMinuteBefore(Date d, int minute) 
        Calendar now = Calendar.getInstance();
        now.setTime(d);
        now.set(Calendar.MINUTE, now.get(Calendar.MINUTE) - minute);
        return now.getTime();
    
    
    /**  
     * 得到指定时间的几个小时后的时间 
     * @param d 指定时间
     * @param hour 小时
     * @return
     */  
    public static Date getHourAfter(Date d, int hour) 
        Calendar now = Calendar.getInstance();
        now.setTime(d);
        now.set(Calendar.HOUR, now.get(Calendar.HOUR) + hour);
        return now.getTime();
    
    
     
    /**  
     * 得到指定时间的几个小时前的时间 
     * @param d 指定时间
     * @param hour 小时
     * @return
     */  
    public static Date getHourBefore(Date d, int hour) 
        Calendar now = Calendar.getInstance();
        now.setTime(d);
        now.set(Calendar.HOUR, now.get(Calendar.HOUR) - hour);
        return now.getTime();
    
    
    /**  
     * 得到指定时间的几天前的时间 
     * @param d 指定时间
     * @param hour 小时
     * @return
     */  
    public static Date getDayBefore(Date d, int day) 
        Calendar now = Calendar.getInstance();
        now.setTime(d);
        now.set(Calendar.DAY_OF_MONTH, now.get(Calendar.DAY_OF_MONTH) - day);
        return now.getTime();
    
    
    /**  
     * 得到指定时间的几月前的时间 
     * @param d 指定时间
     * @param hour 小时
     * @return
     */  
    public static Date getMonthBefore(Date d, int month) 
        Calendar now = Calendar.getInstance();
        now.setTime(d);
        now.set(Calendar.MONTH, now.get(Calendar.MONTH) - month);
        return now.getTime();
    
    
    /**  
     * 得到指定时间的几年前的时间 
     * @param d 指定时间
     * @param hour 小时
     * @return
     */  
    public static Date getYearBefore(Date d, int year) 
        Calendar now = Calendar.getInstance();
        now.setTime(d);
        now.set(Calendar.YEAR, now.get(Calendar.YEAR) - year);
        return now.getTime();