java Calendar Date 获取传入日期所在月或年的第一天和最后一天

1、获取传入日期所在月的第一天

    public static Date getFirstDayDateOfMonth(final Date date) {
        final Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        final int last = cal.getActualMinimum(Calendar.DAY_OF_MONTH);
        cal.set(Calendar.DAY_OF_MONTH, last);
        return cal.getTime();
    }

2、获取传入日期所在月的最后一天

    public static Date getLastDayOfMonth(final Date date) {
        final Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        final int last = cal.getActualMaximum(Calendar.DAY_OF_MONTH);
        cal.set(Calendar.DAY_OF_MONTH, last);
        return cal.getTime();
    }

3、获取传入日期所在年的第一天

    public static Date getFirstDayDateOfYear(final Date date) {
        final Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        final int last = cal.getActualMinimum(Calendar.DAY_OF_YEAR);
        cal.set(Calendar.DAY_OF_YEAR, last);
        return cal.getTime();
    }

4、获取传入日期所在年的最后一天

    public static Date getLastDayOfYear(final Date date) {
        final Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        final int last = cal.getActualMaximum(Calendar.DAY_OF_YEAR);
        cal.set(Calendar.DAY_OF_YEAR, last);
        return cal.getTime();
    }