Function date

components/drivers/rtc/dev_rtc.c:280–371

* get date and time or set (local timezone) [year month day hour min sec] */

 * get date and time or set (local timezone) [year month day hour min sec]
 */
static void date(int argc, char **argv)
{
    time_t now = (time_t)0;

    if (argc == 1)
    {
        struct timeval tv = { 0 };
        int32_t tz_offset_sec = 0;
        uint32_t abs_tz_offset_sec = 0U;

#if defined(RT_LIBC_USING_LIGHT_TZ_DST)
        tz_offset_sec = rt_tz_get();
#endif /* RT_LIBC_USING_LIGHT_TZ_DST */

        gettimeofday(&tv, RT_NULL);
        now = tv.tv_sec;

        abs_tz_offset_sec = tz_offset_sec > 0 ? tz_offset_sec : -tz_offset_sec;
        /* output current time */
        rt_kprintf("local time: %.*s", 25U, ctime(&now));
        rt_kprintf("timestamps: %ld\n", (long)tv.tv_sec);
        rt_kprintf("timezone: UTC%c%02d:%02d:%02d\n",
            tz_offset_sec > 0 ? '+' : '-', abs_tz_offset_sec / 3600U, abs_tz_offset_sec % 3600U / 60U, abs_tz_offset_sec % 3600U % 60U);
    }
    else if (argc >= 7)
    {
        /* set time and date */
        struct tm tm_new = {0};
        time_t old = (time_t)0;
        rt_err_t err;

        tm_new.tm_year = atoi(argv[1]) - 1900;
        tm_new.tm_mon = atoi(argv[2]) - 1; /* .tm_min's range is [0-11] */
        tm_new.tm_mday = atoi(argv[3]);
        tm_new.tm_hour = atoi(argv[4]);
        tm_new.tm_min = atoi(argv[5]);
        tm_new.tm_sec = atoi(argv[6]);
        if (tm_new.tm_year <= 0)
        {
            rt_kprintf("year is out of range [1900-]\n");
            return;
        }
        if (tm_new.tm_mon > 11) /* .tm_min's range is [0-11] */
        {
            rt_kprintf("month is out of range [1-12]\n");
            return;
        }
        if (tm_new.tm_mday == 0 || tm_new.tm_mday > 31)
        {
            rt_kprintf("day is out of range [1-31]\n");
            return;
        }
        if (tm_new.tm_hour > 23)
        {
            rt_kprintf("hour is out of range [0-23]\n");
            return;
        }
        if (tm_new.tm_min > 59)