How to use the calendar_example to extract the current time

[codebreaker176]

How to extract the current time from the calendar_example, i am not clear with the procedure

[ovrebekk]

Hi 

You would use the nrf_cal_get_time(void) function for this. 

It returns a pointer to a tm struct which contains the current time in seconds, minutes, hours and so on. 

You can also use the nrf_cal_get_time_string(bool calibrated) function if you just want a string representation of the current time. 

Best regards
Torbjørn

[codebreaker176]

Hi,

nrf_log module doesnt work now.. I am working on it, mean while can you please check this out..

this was the output when i used int datatype

EDIT : I am getting the same result using the character array pointer as well

below is the code i used for character array

 char k[16];
        for(int i = 0; i < sizeof(nrf_cal_get_time_string(true)); i++) {
        k[i] = nrf_cal_get_time_string(true)[i];
        }
      err_code = ble_nus_data_send(&m_nus, k, &lendt, m_conn_handle);

[ovrebekk]

Hi Adeel 

Anything is possible, but I am not sure how much sense it makes to adapt the calendar example when the date_time library is available in NCS/Zephyr. 

I modified the example I shared earlier to set up a standard Zephyr timer, and use that to update the timestamp in a fashion similar to the calendar example. 

The difference is that it uses the date_time library to get the time initially, and then defaults to using a timer afterwards to reduce the need of calling date_time repeatedly. 

Please have a look at the updated example and see if it gets you closer to what you need:
https://github.com/too1/mqtt_w_date_time

Best regards
Torbjørn

[Adeel]

Hi Tobjorn,

Thanks, this is a perfect example to work on now. 

I just had to ask a question which was related to time synchronization. 

 

I see that the real time differs by 2 hrs : 14:13 to 16:13 . Just wanted to know if this could be fixed by tinkering with the values. This would be the perfect time stamp for my usage :).

Regards,

Adeel.

[Adeel]

sorry , I meant 16:12 to 18:12. I see a gap of 2 hrs. Just needed a heads up on how to calibrate it :).

[Adeel]

I understand now that the time I am getting is UTC from the NTP server.

How could I convert it to get a time in CEST zone ?

Regards,

Adeel.

[ovrebekk]

Hi Adeel

I must admit I asked myself the same question ;)

The naive way is to simply add 2 hours to the timestamp before you do the conversion. 

If my math is correct two hours should equal 7.200.000 ms, or 7200 seconds. 

I will check with the date_time developer if there is a more elegant way to do this, that checks the local timezone and adjust the time accordingly. 

Best regards
Torbjørn

[Adeel]

Hi Tobjorn,

No worries, You could let me know if you get any heads up on this. I can continue on with the development through this for now :). 

Thanks a lot for the help .

[ovrebekk]

Hi Adeel

The developer basically suggested the same thing ;)

Time zone adjustment will need to happen separately, by adding or subtracting the required number of hours from the timestamp. 

Best regards
Torbjørn

[Adeel]

Hi Tobjorn,

Thanks for the update on this. Yes, I think it makes sense as well since different time zones can adapt differently just by adding the hours based on their difference to the UTC :).

Many thanks, I have adjusted it to my zone by adding the reqd. number of hours :).

Regards,

Adeel.

[ovrebekk]

Hi Adeel

You welcome, I will consider this case closed for now then

Best regards
Torbjørn