Parse CCLK with strptime

example:

ctime="+CCLK: "22/09/19,03:21:12+32""
void parsetime (const char *ctime)
{

    char ptime[32]; //parse time
    char *buf=(char *)malloc(sizeof(char) * 32);
    struct tm tt;
    time_t putime, \
           nutime;
    int time_zone=0;

    sscanf(ctime, "%s %s", buf, ptime);
    free(buf);

    buf=strstr(ptime, "+");
    if (buf == NULL)
	buf=strstr(ptime, "-");
    if (buf == NULL)
    {
        printf("err: can't find the time zone\n");
        exit(1);
    }
	
    ptime[strlen(ptime)-strlen(buf)]='\0'; //remove time zone and late character
    buf++; //get time zone
    time_zone=atoi(buf);
    buf=ptime+1; //remove first character
    strncpy(ptime, buf, 32);
    printf("time_zone=%d, buf=%s, ptime=%s\n", time_zone, buf, ptime);
    

    strptime(ptime, "%y/%m/%d,%H:%M:%S", &tt);
    tt.tm_hour+=(time_zone/4);
    printf("tm_sec:  %d\n",tt.tm_sec);
    printf("tm_min:  %d\n",tt.tm_min);
    printf("tm_hour:  %d\n",tt.tm_hour);
    printf("tm_mday:  %d\n",tt.tm_mday);
    printf("tm_mon:  %d\n",tt.tm_mon+1);
    printf("tm_year:  %d\n",tt.tm_year-100);


    putime = mktime(&tt);
    nutime=(long int)time(NULL);
    printf("nutime-putime=%ld\n", nutime-putime);
    return;
}

ref:
strptime



PLS83, RIL(libril-cwm-lte) network.c

void parseNITZresponse(char *szNITZrepsonse)
{
    ...
    ...
    // All parameters available: generate NITZ notifications.
    generateNITZnotification(nitzUtUCS2, nitzTZ, nitzDST);
}


other keywords:
    RIL_UNSOL_NITZ_TIME_RECEIVED

Other keywords in Android:

frameworks/opt/telephony/src/java/com/android/internal/telephony/ServiceStateTracker.java
    setTimeFromNITZString(nitzString, nitzReceiveTime)

ref:
1. android 手機的網絡時間同步
2. https://www.itdaan.com/tw/7a3b63850d9d