java 时间操作

java 时间操作

    private static final String HOUR_FORMAT = "%02d00";

    private static final String HOUR_FORMAT_SCALE = "%.2s:00";

    /**
     * 获取系统当前时间小时数
     *
     * @return
     */
    public static String getCurHour24() {
        Calendar calendar = Calendar.getInstance();
        int curHour24 = calendar.get(Calendar.HOUR_OF_DAY);
        return String.format(HOUR_FORMAT, curHour24);
    }


    /**
     * j将4位小时数转换为冒号隔开的
     * @param hour
     * @return
     */
    public static String getCurHour24Scale(String hour) {
        return String.format(HOUR_FORMAT_SCALE, hour);
    }

    /**
     * 将时间戳转化为时间
     *
     * @param timestamp
     * @return
     */
    public static LocalDateTime convertDate(Long timestamp) {
        LocalDateTime dateTime = LocalDateTime.ofInstant(Instant.ofEpochSecond(timestamp), TimeZone
                .getDefault().toZoneId());
        return dateTime;
    }


    /**
     * 获取昨天零点时间戳
     *
     * @return
     */
    public static Long yesterdayStart() {
        LocalDateTime yesterdayStart = LocalDateTime.of(LocalDate.now(), LocalTime.MIN).minus(Period.ofDays(1));
        return convertMilli(yesterdayStart);
    }

    /**
     * 获取昨天时间
     *
     * @return
     */
    public static LocalDate yesterdayTime() {
        LocalDate yesterdayTime = LocalDate.now().minus(Period.ofDays(1));
        return yesterdayTime;
    }


    /**
     * 获取昨天结束时间戳
     */
    public static Long yesterdayEnd() {
        LocalDateTime yesterdayEnd = LocalDateTime.of(LocalDate.now(), LocalTime.MAX).minus(Period.ofDays(1));
        // DateTimeFormatter time = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        return convertMilli(yesterdayEnd);
    }

    /**
     * 将时间转化为时间戳
     *
     * @return
     */
    public static Long convertMilli(LocalDateTime dateTime) {
        long epochMilli = dateTime.toInstant(ZoneOffset.of("+8")).getEpochSecond();
        return epochMilli;
    }

    /**
     * 将时间格式转化为yyyyMMdd
     *
     * @param time
     * @return
     */
    public static String convertDate(LocalDate time) {
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMdd");
        return time.format(formatter);
    }

    /**
     * LocalDate转String
     * @param
     */
    public static String converString(LocalDate time){
        DateTimeFormatter fmt = DateTimeFormatter.ofPattern("yyyy-MM-dd");
        return time.format(fmt);
    }

    public static void main(String[] args) {
        System.out.println(String.format("%02d00", 9));

    }