How to convert date and time to timestamp?

RE: How to convert date and time to timestamp?

Bastien Reynard — Tue, 20 Mar 2018 13:20:33 GMT

Did you check that the month in ble_date_time_t is returned as a value from 0 to 11 (not 1-12)?

struct tm {
    ...
    int tm_mon;   /* months since January, 0 to 11 */
    ...
};

RE: How to convert date and time to timestamp?

IlyaM — Mon, 19 Mar 2018 15:40:09 GMT

yes, always 1 month forward, I subtract 1 month from current month to get correct value, but it's not right solution, I guess

RE: How to convert date and time to timestamp?

Bjørn Kvaale — Mon, 19 Mar 2018 15:35:52 GMT

Is the time always one month forward? If so, it seems like there is some kind of offset that leads to an incorrect date.

RE: How to convert date and time to timestamp?

IlyaM — Mon, 19 Mar 2018 07:57:32 GMT

My app based on this current time application, and I got the correct date and time, but when I put it in tm structure and called mktime, I got wrong value of timestamp. Usually one month forward, i.e. if today is 19.03.2018 10:56:34, then my timestamp (after converting back in online service) shows 19.04.2018 10:56:34 (or UTC0 7:56:34)

RE: How to convert date and time to timestamp?

Bjørn Kvaale — Wed, 14 Mar 2018 10:36:22 GMT

This devzone case might be helpful. In addition, the current time application in the nrf sdk could be helpful. See the current_time_print() function in the main.c file for more info. The current_time_print() function also takes in a ble_cts_c_evt_t struct & converts the data to hours, minutes, seconds & fractions of a second.

RE: How to convert date and time to timestamp?

IlyaM — Tue, 13 Mar 2018 11:18:19 GMT

If I use mktime, I get incorrect data

struct tm time_struct;
ble_date_time_t datetime = p_evt->params.current_time.exact_time_256.day_date_time.date_time;
time_t newtime;
time_struct.tm_year = datetime.year - 1900;
time_struct.tm_mon = datetime.month;
time_struct.tm_mday = datetime.day;
time_struct.tm_hour = datetime.hours;
time_struct.tm_min = datetime.minutes;
time_struct.tm_sec = datetime.seconds;
newtime = mktime(&time_struct);

NRF_LOG_INFO("Timestamp is %ld\r\n", newtime); // got tomorrow day

RE: How to convert date and time to timestamp?

Bastien Reynard — Tue, 13 Mar 2018 09:22:33 GMT

You could use the mktime() function from the ANSI C library. See this example.