PLIST_DATE Parsing crash！！！

[Amoystyle]

case PLIST_DATE:
        tag = XPLIST_DATE;
        tag_len = XPLIST_DATE_LEN;
        {
            Time64_T timev = (Time64_T)node_data->realval + MAC_EPOCH;
            struct TM _btime;
            struct TM *btime = gmtime64_r(&timev, &_btime);
            if (btime) {
                val = (char*)calloc(1, 24);
                struct tm _tmcopy;
                copy_TM64_to_tm(btime, &_tmcopy);
                val_len = strftime(val, 24, "%Y-%m-%dT%H:%M:%SZ", &_tmcopy); <--------
                if (val_len <= 0) {
                    free (val);
                    val = NULL;
                }
            }
        }
        break;

Parsing crash com.apple.Bluetooth.plist.zip