给当前时间添加时间

给当前时间添加年数：

 /**
     * Adds a number of years to a date returning a new object.
     * The original {@code Date} is unchanged.
     *
     * @param date  the date, not null
     * @param amount  the amount to add, may be negative
     * @return the new {@code Date} with the amount added
     * @throws IllegalArgumentException if the date is null
     */
    public static Date addYears(final Date date, final int amount) {
        return add(date, Calendar.YEAR, amount);
    }

给当前时间添加月数：

/**
     * Adds a number of months to a date returning a new object.
     * The original {@code Date} is unchanged.
     *
     * @param date  the date, not null
     * @param amount  the amount to add, may be negative
     * @return the new {@code Date} with the amount added
     * @throws IllegalArgumentException if the date is null
     */
    public static Date addMonths(final Date date, final int amount) {
        return add(date, Calendar.MONTH, amount);
    }

给当前时间添加周数：

/**
     * Adds a number of weeks to a date returning a new object.
     * The original {@code Date} is unchanged.
     *
     * @param date  the date, not null
     * @param amount  the amount to add, may be negative
     * @return the new {@code Date} with the amount added
     * @throws IllegalArgumentException if the date is null
     */
    public static Date addWeeks(final Date date, final int amount) {
        return add(date, Calendar.WEEK_OF_YEAR, amount);
    }

给当前时间添加天数：

 /**
     * Adds a number of days to a date returning a new object.
     * The original {@code Date} is unchanged.
     *
     * @param date  the date, not null
     * @param amount  the amount to add, may be negative
     * @return the new {@code Date} with the amount added
     * @throws IllegalArgumentException if the date is null
     */
    public static Date addDays(final Date date, final int amount) {
        return add(date, Calendar.DAY_OF_MONTH, amount);
    }

给当前时间添加小时数：

/**
     * Adds a number of hours to a date returning a new object.
     * The original {@code Date} is unchanged.
     *
     * @param date  the date, not null
     * @param amount  the amount to add, may be negative
     * @return the new {@code Date} with the amount added
     * @throws IllegalArgumentException if the date is null
     */
    public static Date addHours(final Date date, final int amount) {
        return add(date, Calendar.HOUR_OF_DAY, amount);
    }

给当前时间添加分钟数：

/**
     * Adds a number of minutes to a date returning a new object.
     * The original {@code Date} is unchanged.
     *
     * @param date  the date, not null
     * @param amount  the amount to add, may be negative
     * @return the new {@code Date} with the amount added
     * @throws IllegalArgumentException if the date is null
     */
    public static Date addMinutes(final Date date, final int amount) {
        return add(date, Calendar.MINUTE, amount);
    }

给当前时间添加秒数：

/**
     * Adds a number of seconds to a date returning a new object.
     * The original {@code Date} is unchanged.
     *
     * @param date  the date, not null
     * @param amount  the amount to add, may be negative
     * @return the new {@code Date} with the amount added
     * @throws IllegalArgumentException if the date is null
     */
    public static Date addSeconds(final Date date, final int amount) {
        return add(date, Calendar.SECOND, amount);
    }

给当前时间添加毫秒数：

 /**
     * Adds a number of milliseconds to a date returning a new object.
     * The original {@code Date} is unchanged.
     *
     * @param date  the date, not null
     * @param amount  the amount to add, may be negative
     * @return the new {@code Date} with the amount added
     * @throws IllegalArgumentException if the date is null
     */
    public static Date addMilliseconds(final Date date, final int amount) {
        return add(date, Calendar.MILLISECOND, amount);
    }

事例：

public static void main(String[] args) {


        Date date = new Date();
//        Date date1 = DateUtils.addDays(date, 10);
        System.out.println("现在的时间是：   "+date);


        Date date1 = DateUtils.addYears(date, -100);
        System.out.println("addYears的时间是：   "+date1);

    }

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