java 时间工具类以及时间转换

系统管理员 2021-09-02 10:51 415阅读 0赞

java 时间工具类

//将日期字符串剪切成时间    2019-10-10 23:59:59
    public static String getOnlyTime(String dateString){
        String substring = dateString.substring(11);
        return substring;
    }
    
    //传入时间格式为 08:20:20
    public static Date getTime(String dateString)throws ParseException {
        SimpleDateFormat dfEndTime = new SimpleDateFormat("HH:mm:ss");
        Date parse = dfEndTime.parse(dateString);
        return parse;
    }
    
    //将日期字符串装换 时分秒时间
    public static Date getHourAndSecondsTime(String dateString) throws ParseException {
        SimpleDateFormat df = new SimpleDateFormat("HH:mm:ss");
        Date date = df.parse(dateString.substring(11));
        return date;
    }
    
    //将日期字符串装换 日期时间类型
    public static Date getStringToDateAndTime(String dateString) throws ParseException {
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date date = df.parse(dateString);
        return date;
    }
    
    //将日期装换 日期时间字符串
    public static String getDateToTimeString(Date date) throws ParseException {
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String format = df.format(date);
        return format;
    }
    
    //将日期字符串装换  年月日 日期类型
    public static Date getDateSpecificDate(String dateString) throws ParseException {
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
        Date date = df.parse(dateString);
        return date;
    }
    
    //将日期字符串装换  年月日 日期类型
    public static String getDayString(String dateString) throws ParseException {
        String stringDay = dateString.substring(0,10);
        return stringDay;
    }
    
    //获取每天最晚时间
    public static Date getLastTime()throws ParseException {
        SimpleDateFormat dfEndTime = new SimpleDateFormat("HH:mm:ss");
        Date parse = dfEndTime.parse("23:59:59");
        return parse;
    }
    
    //获取指定时间的后一天
    public static String getLastOneDay(String dateString) throws ParseException {
        SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd");
        Date parse = sf.parse(dateString);
        Calendar c = Calendar.getInstance();
        c.setTime(parse);
        c.add(Calendar.DAY_OF_MONTH, 1);
        return sf.format(c.getTime());
    }
    
    /**
     * 获取过去第7天的日期     (- 操作) 或者 未来 第几天的日期( + 操作)
     */
    public static String getCurrentSevenDay() {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.DAY_OF_YEAR, calendar.get(Calendar.DAY_OF_YEAR) - 7);
        Date today = calendar.getTime();
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        String result = format.format(today);
        return result;
    }
    //获取过去多少天的日期
    public static String getCurrentDay(int day) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.DAY_OF_YEAR, calendar.get(Calendar.DAY_OF_YEAR) - day);
        Date today = calendar.getTime();
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        String result = format.format(today);
        return result;
    }