获取时间的特殊字段TimeHelp

public class DateHelp {
    private final static String FORMAT_TIME = "yyyy-MM-dd HH:mm:ss";
    private final static String FORMAT_TO_DEFAULT_TIME = "yyyy-MM-dd 22:00:00";

    /**
     * 获取当前时间
     *
     * @return String（如：2019-06-28 16:46:47）
     */
    public static String getTimeString() {
        @SuppressLint("SimpleDateFormat")
        SimpleDateFormat df = new SimpleDateFormat(FORMAT_TIME);
        Calendar calendar = Calendar.getInstance();
        return df.format(calendar.getTime());
    }

    /**
     * 获取日期年份
     *
     * @param date date
     * @return int (如：2019)
     */
    public static int getYear(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        return calendar.get(Calendar.YEAR);
    }

    /**
     * 功能描述：返回月
     *
     * @param date date
     * @return int (如：10)
     */
    public static int getMonth(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        int mouth = calendar.get(Calendar.MONTH) + 1;
        return mouth > 12 ? 1 : mouth;
    }

    /**
     * 功能描述：返回日期
     *
     * @param date date
     * @return int (如：28)
     */
    public static int getDay(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        return calendar.get(Calendar.DAY_OF_MONTH);
    }

    /**
     * 功能描述：返回小时
     *
     * @param date date
     * @return int (如：12)
     */
    public static int getHour(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        return calendar.get(Calendar.HOUR_OF_DAY);
    }

    /**
     * 功能描述：返回分
     *
     * @param date date
     * @return int (如：60)
     */
    public static int getMinute(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        return calendar.get(Calendar.MINUTE);
    }

    /**
     * 返回秒钟
     *
     * @param date date
     * @return int (如：60)
     */
    public static int getSecond(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        return calendar.get(Calendar.SECOND);
    }

    /**
     * 功能描述：返回毫
     *
     * @param date date
     * @return int (如：60)
     */
    public static long getMillis(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        return calendar.getTimeInMillis();
    }

    /**
     * 功能描述：将传入的时间（String类型）转化成long
     * 传入时间格式如："2019-06-28 16:46:47"
     *
     * @param time time
     * @return long
     */
    public static long defaultEndTime(String time) {
        @SuppressLint("SimpleDateFormat")
        SimpleDateFormat dateFormat = new SimpleDateFormat(FORMAT_TIME);
        long mTime = 0;
        try {
            Date date = dateFormat.parse(time);
            mTime = date.getTime();
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return mTime;
    }

    /**
     * 功能描述：获取当前年月日下的22:00:00
     * 返回的结果如：2019-06-28 2:00:00"
     * （只有22:00:00不会变）
     *
     * @return String
     */
    public static String endTime() {
        @SuppressLint("SimpleDateFormat")
        SimpleDateFormat dateFormat = new SimpleDateFormat(FORMAT_TO_DEFAULT_TIME);
        Calendar cal = Calendar.getInstance();
        long time = cal.getTimeInMillis();
        Date date = new Date(time);
        return dateFormat.format(date);
    }

    /**
     * 功能描述：推迟或提前月份
     * 如：当前是"2019-06-28 22:00:00"  返回"2019-08-28 22:00:00"
     *
     * @param isDelay 月份是推迟还是提前
     * @param number  推迟或提前月份多少月
     * @return String
     */
    public static String getDelayTime(boolean isDelay, int number) {
        @SuppressLint("SimpleDateFormat")
        SimpleDateFormat dateFormat = new SimpleDateFormat(FORMAT_TO_DEFAULT_TIME);
        Calendar calendar = Calendar.getInstance();
        if (isDelay) {
            //得到后几个月
            calendar.add(Calendar.MONTH, +number);
        } else {
            //得到前几个月
            calendar.add(Calendar.MONTH, -number);
        }
        long timeInMillis = calendar.getTimeInMillis();
        Date date = new Date(timeInMillis);
        return dateFormat.format(date);
    }
}