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Timezone information with text file backend #210
Description
We're currently working on adding logging to our application and trying to get a log file in the following format: test_20230607T165634+0200.log
With the following code however, the resulting log file is test_20230607T165634.log. After reading the documentation is seems that boost log does not support any of the time zone flags, since it uses ptime internally (https://www.boost.org/doc/libs/1_82_0/doc/html/date_time/date_time_io.html#date_time.format_flags). Could support for this be added?
#include <boost/log/trivial.hpp>
#include <boost/log/utility/setup/file.hpp>
void init_logger(const std::string& filename)
{
auto sink = boost::log::add_file_log(boost::log::keywords::file_name = filename + "_%Y%m%dT%H%M%S%q.log");
}
int main(int, char**)
{
init_logger("test");
BOOST_LOG_TRIVIAL(info) << "Hello, World!";
}
Activity
Lastique commentedon Jul 2, 2023
This is not easy to do, since Boost.DateTime does not allow to create a time zone object that reflects the time zone set on the system. There doesn't seem to be a portable way to obtain this information either, at least I'm not aware of one. I reported this to Boost.DateTime, but the chances for this to be implemented soon are rather slim, unfortunately.
otopetrik commentedon Oct 9, 2023
It could be useful to have configuration option to use UTC time for file names.
Instead of having log file names with times in unknown time zone, the timezone would be known.
Especially useful if already using
attributes::utc_clockforTimeStampLooks like
local_time_traits::get_clock()is hardcoded, with no way to useutc_time_traitslog/src/text_file_backend.cpp
Line 242 in ae9bf80