Re: [Boost-users] convert separate year, month, day, hour, minute, secs, ms to milliseconds since epoch

On Sun, 3 Mar 2019 12:45:17 -0800 Victor Yankee via Boost-users wrote:

I am using C++14 and boost 1.64.0 (could move to newest boost), and need to convert date and time pieces to a single value for milliseconds since the epoch. This is what I have:

int64_t msSinceEpoch(int year,int month,int day,int hour,int minute,int second,int ms) { struct std::tm t; t.tm_sec = second; t.tm_min = minute; t.tm_hour = hour; t.tm_mday = day; t.tm_mon = month-1; t.tm_year = year-1900; t.tm_isdst = 0; return (1000* timegm(&t))+ms; // is timegm cross-platform? }

Is there a better way?

Sorry, previous was for seconds #include int64_t time_msec_since_epoch(int year, int month, int day, int hour, int minute, int second, int msec) { static const boost::posix_time::ptime epoch(boost::gregorian::date(1970,1,1)); boost::posix_time::ptime pt( boost::gregorian::date(year, month, day), boost::posix_time::time_duration(hour, minute, second) + boost::posix_time::milliseconds(msec) ); boost::posix_time::time_duration since_epoch = pt - epoch; return since_epoch.total_milliseconds(); } -- Best regards, Sergey Spiridonov