I try to find a thread-safe way to get local time. From boost example, I got this:
#include "boost/date_time/posix_time/posix_time.hpp"
#include <iostream>
int
main()
{
using namespace boost::posix_time;
using namespace boost::gregorian;
//get the current time from the clock -- one second resolution
ptime now = second_clock::local_time();
//Get the date part out of the time
date today = now.date();
date tommorrow = today + days(1);
ptime tommorrow_start(tommorrow); //midnight
//iterator adds by one hour
time_iterator titr(now,hours(1));
for (; titr < tommorrow_start; ++titr) {
std::cout << to_simple_string(*titr) << std::endl;
}
time_duration remaining = tommorrow_start - now;
std::cout << "Time left till midnight: "
<< to_simple_string(remaining) << std::endl;
return 0;
}
But I didn't know if it can be used in multi-threading environment?
Yes, of your platform has support for it:
Date-time now uses reentrant POSIX functions on those platforms that support them when BOOST_HAS_THREADS is defined.
From here
BOOST_HAS_THREADS is basically always defined these days. You can check your platform's POSIX support if you doubt things.
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