need to timestamp to ms resolution AND be able to codegen it to C++

datetime command is doing what i need (provides time resolution to ms) BUT its not allowed by codegen. Is there equivalent command that does codegen? datetime('now','TimeZone','local','Format','d-MMM-y HH:mm:ss:ssssss Z'); Alternatively, datetime('now') codegens BUT need resolution to ms.

Answer 1

[Ramtej]

Hi

While you can't directly use the full formatting and timezone features of the "datetime" function in a codegen context, you can still capture high-resolution time. One approach is to use basic "datetime" functionality that is supported by codegen and then manually manipulate or format the output as needed.

Here's the workaround:

• Create your own datetime function which outputs the milli seconds by manipulating the original "datetime" output

function [year , month, day, hour, minute, second,ms] = myDatetime()  
currentTime = datetime('now');

year = currentTime.Year;
month = currentTime.Month;
day = currentTime.Day;
hour = currentTime.Hour;
minute = currentTime.Minute;
second = currentTime.Second;

integ=floor(second);
ms=floor((second-integ)*1000); % Note sometimes you may loose precision here when number of decimals are greater the 4
end

• Replace the builit-in "datetime" function with your function "myDatetime" in your code and regenerate your C/C++ code.

[Eugene K]

Thank you. This converts to C++ but there is a resolution issue. When event happens I put a timestamp. In Matlab i see 6 numbers after decimal. But when codegen runs it there are only 3 digits after decimal. I realized hat i do need more than ms resolution. Is there a way to increase both MAtlab and C++ resolution?

In Matlab:

Date: 2024- 4-10 Time: 8:46:54.013099

Date: 2024- 4-10 Time: 8:46:54.024811

Date: 2024- 4-10 Time: 8:46:54.036219

In C++

Date: 2024- 4-10 Time: 8:48:43.122000

Date: 2024- 4-10 Time: 8:48:43.127000

Date: 2024- 4-10 Time: 8:48:43.132000

[Eugene K]

just fyi, i am doing this...

T = datetime('now');

fprintf('Date: %4.0f-%2.0f-%2.0f Time: %2.0f:%2.0f:%9.6f ', T.Year, T.Month, T.Day, T.Hour, T.Minute, T.Second);

fprintf('\n');